diff --git a/packages/react-native-codegen/e2e/__tests__/components/__snapshots__/GenerateComponentDescriptorH-test.js.snap b/packages/react-native-codegen/e2e/__tests__/components/__snapshots__/GenerateComponentDescriptorH-test.js.snap
index 74f0e533357b01..e989a3b2ecabf1 100644
--- a/packages/react-native-codegen/e2e/__tests__/components/__snapshots__/GenerateComponentDescriptorH-test.js.snap
+++ b/packages/react-native-codegen/e2e/__tests__/components/__snapshots__/GenerateComponentDescriptorH-test.js.snap
@@ -17,13 +17,11 @@ Object {
 #include <react/renderer/components/RNCodegenModuleFixtures/ShadowNodes.h>
 #include <react/renderer/core/ConcreteComponentDescriptor.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 using ArrayPropsNativeComponentViewComponentDescriptor = ConcreteComponentDescriptor<ArrayPropsNativeComponentViewShadowNode>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -45,13 +43,11 @@ Object {
 #include <react/renderer/components/RNCodegenModuleFixtures/ShadowNodes.h>
 #include <react/renderer/core/ConcreteComponentDescriptor.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 using BooleanPropNativeComponentViewComponentDescriptor = ConcreteComponentDescriptor<BooleanPropNativeComponentViewShadowNode>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -73,13 +69,11 @@ Object {
 #include <react/renderer/components/RNCodegenModuleFixtures/ShadowNodes.h>
 #include <react/renderer/core/ConcreteComponentDescriptor.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 using ColorPropNativeComponentViewComponentDescriptor = ConcreteComponentDescriptor<ColorPropNativeComponentViewShadowNode>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -101,13 +95,11 @@ Object {
 #include <react/renderer/components/RNCodegenModuleFixtures/ShadowNodes.h>
 #include <react/renderer/core/ConcreteComponentDescriptor.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 using DimensionPropNativeComponentViewComponentDescriptor = ConcreteComponentDescriptor<DimensionPropNativeComponentViewShadowNode>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -129,13 +121,11 @@ Object {
 #include <react/renderer/components/RNCodegenModuleFixtures/ShadowNodes.h>
 #include <react/renderer/core/ConcreteComponentDescriptor.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 using EdgeInsetsPropNativeComponentViewComponentDescriptor = ConcreteComponentDescriptor<EdgeInsetsPropNativeComponentViewShadowNode>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -157,13 +147,11 @@ Object {
 #include <react/renderer/components/RNCodegenModuleFixtures/ShadowNodes.h>
 #include <react/renderer/core/ConcreteComponentDescriptor.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 using EnumPropNativeComponentViewComponentDescriptor = ConcreteComponentDescriptor<EnumPropNativeComponentViewShadowNode>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -185,13 +173,11 @@ Object {
 #include <react/renderer/components/RNCodegenModuleFixtures/ShadowNodes.h>
 #include <react/renderer/core/ConcreteComponentDescriptor.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 using EventNestedObjectPropsNativeComponentViewComponentDescriptor = ConcreteComponentDescriptor<EventNestedObjectPropsNativeComponentViewShadowNode>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -213,13 +199,11 @@ Object {
 #include <react/renderer/components/RNCodegenModuleFixtures/ShadowNodes.h>
 #include <react/renderer/core/ConcreteComponentDescriptor.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 using EventPropsNativeComponentViewComponentDescriptor = ConcreteComponentDescriptor<EventPropsNativeComponentViewShadowNode>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -241,13 +225,11 @@ Object {
 #include <react/renderer/components/RNCodegenModuleFixtures/ShadowNodes.h>
 #include <react/renderer/core/ConcreteComponentDescriptor.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 using FloatPropsNativeComponentViewComponentDescriptor = ConcreteComponentDescriptor<FloatPropsNativeComponentViewShadowNode>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -269,13 +251,11 @@ Object {
 #include <react/renderer/components/RNCodegenModuleFixtures/ShadowNodes.h>
 #include <react/renderer/core/ConcreteComponentDescriptor.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 using ImagePropNativeComponentViewComponentDescriptor = ConcreteComponentDescriptor<ImagePropNativeComponentViewShadowNode>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -297,13 +277,11 @@ Object {
 #include <react/renderer/components/RNCodegenModuleFixtures/ShadowNodes.h>
 #include <react/renderer/core/ConcreteComponentDescriptor.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 using IntegerPropNativeComponentViewComponentDescriptor = ConcreteComponentDescriptor<IntegerPropNativeComponentViewShadowNode>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -325,13 +303,11 @@ Object {
 #include <react/renderer/components/RNCodegenModuleFixtures/ShadowNodes.h>
 #include <react/renderer/core/ConcreteComponentDescriptor.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -353,13 +329,11 @@ Object {
 #include <react/renderer/components/RNCodegenModuleFixtures/ShadowNodes.h>
 #include <react/renderer/core/ConcreteComponentDescriptor.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 using MixedPropNativeComponentViewComponentDescriptor = ConcreteComponentDescriptor<MixedPropNativeComponentViewShadowNode>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -381,13 +355,11 @@ Object {
 #include <react/renderer/components/RNCodegenModuleFixtures/ShadowNodes.h>
 #include <react/renderer/core/ConcreteComponentDescriptor.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 using MultiNativePropNativeComponentViewComponentDescriptor = ConcreteComponentDescriptor<MultiNativePropNativeComponentViewShadowNode>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -409,13 +381,11 @@ Object {
 #include <react/renderer/components/RNCodegenModuleFixtures/ShadowNodes.h>
 #include <react/renderer/core/ConcreteComponentDescriptor.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 using NoPropsNoEventsNativeComponentViewComponentDescriptor = ConcreteComponentDescriptor<NoPropsNoEventsNativeComponentViewShadowNode>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -437,13 +407,11 @@ Object {
 #include <react/renderer/components/RNCodegenModuleFixtures/ShadowNodes.h>
 #include <react/renderer/core/ConcreteComponentDescriptor.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 using ObjectPropsNativeComponentComponentDescriptor = ConcreteComponentDescriptor<ObjectPropsNativeComponentShadowNode>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -465,13 +433,11 @@ Object {
 #include <react/renderer/components/RNCodegenModuleFixtures/ShadowNodes.h>
 #include <react/renderer/core/ConcreteComponentDescriptor.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 using PointPropNativeComponentViewComponentDescriptor = ConcreteComponentDescriptor<PointPropNativeComponentViewShadowNode>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -493,13 +459,11 @@ Object {
 #include <react/renderer/components/RNCodegenModuleFixtures/ShadowNodes.h>
 #include <react/renderer/core/ConcreteComponentDescriptor.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 using StringPropNativeComponentViewComponentDescriptor = ConcreteComponentDescriptor<StringPropNativeComponentViewShadowNode>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
diff --git a/packages/react-native-codegen/e2e/__tests__/components/__snapshots__/GenerateEventEmitterCpp-test.js.snap b/packages/react-native-codegen/e2e/__tests__/components/__snapshots__/GenerateEventEmitterCpp-test.js.snap
index 433dcad81d4097..bccda779f83e92 100644
--- a/packages/react-native-codegen/e2e/__tests__/components/__snapshots__/GenerateEventEmitterCpp-test.js.snap
+++ b/packages/react-native-codegen/e2e/__tests__/components/__snapshots__/GenerateEventEmitterCpp-test.js.snap
@@ -15,11 +15,9 @@ Object {
 #include <react/renderer/components/RNCodegenModuleFixtures/EventEmitters.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -39,11 +37,9 @@ Object {
 #include <react/renderer/components/RNCodegenModuleFixtures/EventEmitters.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -63,11 +59,9 @@ Object {
 #include <react/renderer/components/RNCodegenModuleFixtures/EventEmitters.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -87,11 +81,9 @@ Object {
 #include <react/renderer/components/RNCodegenModuleFixtures/EventEmitters.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -111,11 +103,9 @@ Object {
 #include <react/renderer/components/RNCodegenModuleFixtures/EventEmitters.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -135,11 +125,9 @@ Object {
 #include <react/renderer/components/RNCodegenModuleFixtures/EventEmitters.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -159,8 +147,7 @@ Object {
 #include <react/renderer/components/RNCodegenModuleFixtures/EventEmitters.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 void EventNestedObjectPropsNativeComponentViewEventEmitter::onChange(OnChange $event) const {
   dispatchEvent(\\"change\\", [$event=std::move($event)](jsi::Runtime &runtime) {
@@ -180,8 +167,7 @@ void EventNestedObjectPropsNativeComponentViewEventEmitter::onChange(OnChange $e
   });
 }
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -201,8 +187,7 @@ Object {
 #include <react/renderer/components/RNCodegenModuleFixtures/EventEmitters.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 void EventPropsNativeComponentViewEventEmitter::onChange(OnChange $event) const {
   dispatchEvent(\\"change\\", [$event=std::move($event)](jsi::Runtime &runtime) {
@@ -260,8 +245,7 @@ void EventPropsNativeComponentViewEventEmitter::onEventBubblingWithPaperName(OnE
   });
 }
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -281,11 +265,9 @@ Object {
 #include <react/renderer/components/RNCodegenModuleFixtures/EventEmitters.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -305,11 +287,9 @@ Object {
 #include <react/renderer/components/RNCodegenModuleFixtures/EventEmitters.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -329,11 +309,9 @@ Object {
 #include <react/renderer/components/RNCodegenModuleFixtures/EventEmitters.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -353,8 +331,7 @@ Object {
 #include <react/renderer/components/RNCodegenModuleFixtures/EventEmitters.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 void InterfaceOnlyNativeComponentViewEventEmitter::onChange(OnChange $event) const {
   dispatchEvent(\\"change\\", [$event=std::move($event)](jsi::Runtime &runtime) {
@@ -364,8 +341,7 @@ void InterfaceOnlyNativeComponentViewEventEmitter::onChange(OnChange $event) con
   });
 }
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -385,11 +361,9 @@ Object {
 #include <react/renderer/components/RNCodegenModuleFixtures/EventEmitters.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -409,11 +383,9 @@ Object {
 #include <react/renderer/components/RNCodegenModuleFixtures/EventEmitters.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -433,11 +405,9 @@ Object {
 #include <react/renderer/components/RNCodegenModuleFixtures/EventEmitters.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -457,11 +427,9 @@ Object {
 #include <react/renderer/components/RNCodegenModuleFixtures/EventEmitters.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -481,11 +449,9 @@ Object {
 #include <react/renderer/components/RNCodegenModuleFixtures/EventEmitters.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -505,11 +471,9 @@ Object {
 #include <react/renderer/components/RNCodegenModuleFixtures/EventEmitters.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
diff --git a/packages/react-native-codegen/e2e/__tests__/components/__snapshots__/GenerateEventEmitterH-test.js.snap b/packages/react-native-codegen/e2e/__tests__/components/__snapshots__/GenerateEventEmitterH-test.js.snap
index 57f16617fe96be..9ae54de91b3069 100644
--- a/packages/react-native-codegen/e2e/__tests__/components/__snapshots__/GenerateEventEmitterH-test.js.snap
+++ b/packages/react-native-codegen/e2e/__tests__/components/__snapshots__/GenerateEventEmitterH-test.js.snap
@@ -16,8 +16,7 @@ Object {
 #include <react/renderer/components/view/ViewEventEmitter.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 class ArrayPropsNativeComponentViewEventEmitter : public ViewEventEmitter {
  public:
   using ViewEventEmitter::ViewEventEmitter;
@@ -25,8 +24,7 @@ class ArrayPropsNativeComponentViewEventEmitter : public ViewEventEmitter {
   
   
 };
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -47,8 +45,7 @@ Object {
 #include <react/renderer/components/view/ViewEventEmitter.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 class BooleanPropNativeComponentViewEventEmitter : public ViewEventEmitter {
  public:
   using ViewEventEmitter::ViewEventEmitter;
@@ -56,8 +53,7 @@ class BooleanPropNativeComponentViewEventEmitter : public ViewEventEmitter {
   
   
 };
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -78,8 +74,7 @@ Object {
 #include <react/renderer/components/view/ViewEventEmitter.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 class ColorPropNativeComponentViewEventEmitter : public ViewEventEmitter {
  public:
   using ViewEventEmitter::ViewEventEmitter;
@@ -87,8 +82,7 @@ class ColorPropNativeComponentViewEventEmitter : public ViewEventEmitter {
   
   
 };
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -109,8 +103,7 @@ Object {
 #include <react/renderer/components/view/ViewEventEmitter.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 class DimensionPropNativeComponentViewEventEmitter : public ViewEventEmitter {
  public:
   using ViewEventEmitter::ViewEventEmitter;
@@ -118,8 +111,7 @@ class DimensionPropNativeComponentViewEventEmitter : public ViewEventEmitter {
   
   
 };
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -140,8 +132,7 @@ Object {
 #include <react/renderer/components/view/ViewEventEmitter.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 class EdgeInsetsPropNativeComponentViewEventEmitter : public ViewEventEmitter {
  public:
   using ViewEventEmitter::ViewEventEmitter;
@@ -149,8 +140,7 @@ class EdgeInsetsPropNativeComponentViewEventEmitter : public ViewEventEmitter {
   
   
 };
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -171,8 +161,7 @@ Object {
 #include <react/renderer/components/view/ViewEventEmitter.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 class EnumPropNativeComponentViewEventEmitter : public ViewEventEmitter {
  public:
   using ViewEventEmitter::ViewEventEmitter;
@@ -180,8 +169,7 @@ class EnumPropNativeComponentViewEventEmitter : public ViewEventEmitter {
   
   
 };
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -202,8 +190,7 @@ Object {
 #include <react/renderer/components/view/ViewEventEmitter.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 class EventNestedObjectPropsNativeComponentViewEventEmitter : public ViewEventEmitter {
  public:
   using ViewEventEmitter::ViewEventEmitter;
@@ -223,8 +210,7 @@ class EventNestedObjectPropsNativeComponentViewEventEmitter : public ViewEventEm
     };
   void onChange(OnChange value) const;
 };
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -245,8 +231,7 @@ Object {
 #include <react/renderer/components/view/ViewEventEmitter.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 class EventPropsNativeComponentViewEventEmitter : public ViewEventEmitter {
  public:
   using ViewEventEmitter::ViewEventEmitter;
@@ -301,8 +286,7 @@ class EventPropsNativeComponentViewEventEmitter : public ViewEventEmitter {
 
   void onEventBubblingWithPaperName(OnEventBubblingWithPaperName value) const;
 };
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -323,8 +307,7 @@ Object {
 #include <react/renderer/components/view/ViewEventEmitter.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 class FloatPropsNativeComponentViewEventEmitter : public ViewEventEmitter {
  public:
   using ViewEventEmitter::ViewEventEmitter;
@@ -332,8 +315,7 @@ class FloatPropsNativeComponentViewEventEmitter : public ViewEventEmitter {
   
   
 };
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -354,8 +336,7 @@ Object {
 #include <react/renderer/components/view/ViewEventEmitter.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 class ImagePropNativeComponentViewEventEmitter : public ViewEventEmitter {
  public:
   using ViewEventEmitter::ViewEventEmitter;
@@ -363,8 +344,7 @@ class ImagePropNativeComponentViewEventEmitter : public ViewEventEmitter {
   
   
 };
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -385,8 +365,7 @@ Object {
 #include <react/renderer/components/view/ViewEventEmitter.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 class IntegerPropNativeComponentViewEventEmitter : public ViewEventEmitter {
  public:
   using ViewEventEmitter::ViewEventEmitter;
@@ -394,8 +373,7 @@ class IntegerPropNativeComponentViewEventEmitter : public ViewEventEmitter {
   
   
 };
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -416,8 +394,7 @@ Object {
 #include <react/renderer/components/view/ViewEventEmitter.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 class InterfaceOnlyNativeComponentViewEventEmitter : public ViewEventEmitter {
  public:
   using ViewEventEmitter::ViewEventEmitter;
@@ -427,8 +404,7 @@ class InterfaceOnlyNativeComponentViewEventEmitter : public ViewEventEmitter {
     };
   void onChange(OnChange value) const;
 };
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -449,8 +425,7 @@ Object {
 #include <react/renderer/components/view/ViewEventEmitter.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 class MixedPropNativeComponentViewEventEmitter : public ViewEventEmitter {
  public:
   using ViewEventEmitter::ViewEventEmitter;
@@ -458,8 +433,7 @@ class MixedPropNativeComponentViewEventEmitter : public ViewEventEmitter {
   
   
 };
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -480,8 +454,7 @@ Object {
 #include <react/renderer/components/view/ViewEventEmitter.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 class MultiNativePropNativeComponentViewEventEmitter : public ViewEventEmitter {
  public:
   using ViewEventEmitter::ViewEventEmitter;
@@ -489,8 +462,7 @@ class MultiNativePropNativeComponentViewEventEmitter : public ViewEventEmitter {
   
   
 };
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -511,8 +483,7 @@ Object {
 #include <react/renderer/components/view/ViewEventEmitter.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 class NoPropsNoEventsNativeComponentViewEventEmitter : public ViewEventEmitter {
  public:
   using ViewEventEmitter::ViewEventEmitter;
@@ -520,8 +491,7 @@ class NoPropsNoEventsNativeComponentViewEventEmitter : public ViewEventEmitter {
   
   
 };
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -542,8 +512,7 @@ Object {
 #include <react/renderer/components/view/ViewEventEmitter.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 class ObjectPropsNativeComponentEventEmitter : public ViewEventEmitter {
  public:
   using ViewEventEmitter::ViewEventEmitter;
@@ -551,8 +520,7 @@ class ObjectPropsNativeComponentEventEmitter : public ViewEventEmitter {
   
   
 };
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -573,8 +541,7 @@ Object {
 #include <react/renderer/components/view/ViewEventEmitter.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 class PointPropNativeComponentViewEventEmitter : public ViewEventEmitter {
  public:
   using ViewEventEmitter::ViewEventEmitter;
@@ -582,8 +549,7 @@ class PointPropNativeComponentViewEventEmitter : public ViewEventEmitter {
   
   
 };
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -604,8 +570,7 @@ Object {
 #include <react/renderer/components/view/ViewEventEmitter.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 class StringPropNativeComponentViewEventEmitter : public ViewEventEmitter {
  public:
   using ViewEventEmitter::ViewEventEmitter;
@@ -613,8 +578,7 @@ class StringPropNativeComponentViewEventEmitter : public ViewEventEmitter {
   
   
 };
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
diff --git a/packages/react-native-codegen/e2e/__tests__/components/__snapshots__/GeneratePropsCpp-test.js.snap b/packages/react-native-codegen/e2e/__tests__/components/__snapshots__/GeneratePropsCpp-test.js.snap
index bcb7abfc4404e6..84ae14b514f519 100644
--- a/packages/react-native-codegen/e2e/__tests__/components/__snapshots__/GeneratePropsCpp-test.js.snap
+++ b/packages/react-native-codegen/e2e/__tests__/components/__snapshots__/GeneratePropsCpp-test.js.snap
@@ -18,8 +18,7 @@ Object {
 #include <react/renderer/core/PropsParserContext.h>
 #include <react/renderer/core/propsConversions.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 ArrayPropsNativeComponentViewProps::ArrayPropsNativeComponentViewProps(
     const PropsParserContext &context,
@@ -40,8 +39,7 @@ ArrayPropsNativeComponentViewProps::ArrayPropsNativeComponentViewProps(
     arrayOfObjects(convertRawProp(context, rawProps, \\"arrayOfObjects\\", sourceProps.arrayOfObjects, {}))
       {}
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -62,8 +60,7 @@ Object {
 #include <react/renderer/core/PropsParserContext.h>
 #include <react/renderer/core/propsConversions.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 BooleanPropNativeComponentViewProps::BooleanPropNativeComponentViewProps(
     const PropsParserContext &context,
@@ -74,8 +71,7 @@ BooleanPropNativeComponentViewProps::BooleanPropNativeComponentViewProps(
     disabledNullable(convertRawProp(context, rawProps, \\"disabledNullable\\", sourceProps.disabledNullable, {}))
       {}
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -96,8 +92,7 @@ Object {
 #include <react/renderer/core/PropsParserContext.h>
 #include <react/renderer/core/propsConversions.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 ColorPropNativeComponentViewProps::ColorPropNativeComponentViewProps(
     const PropsParserContext &context,
@@ -107,8 +102,7 @@ ColorPropNativeComponentViewProps::ColorPropNativeComponentViewProps(
     tintColor(convertRawProp(context, rawProps, \\"tintColor\\", sourceProps.tintColor, {}))
       {}
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -130,8 +124,7 @@ Object {
 #include <react/renderer/core/PropsParserContext.h>
 #include <react/renderer/core/propsConversions.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 DimensionPropNativeComponentViewProps::DimensionPropNativeComponentViewProps(
     const PropsParserContext &context,
@@ -141,8 +134,7 @@ DimensionPropNativeComponentViewProps::DimensionPropNativeComponentViewProps(
     marginBack(convertRawProp(context, rawProps, \\"marginBack\\", sourceProps.marginBack, {}))
       {}
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -163,8 +155,7 @@ Object {
 #include <react/renderer/core/PropsParserContext.h>
 #include <react/renderer/core/propsConversions.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 EdgeInsetsPropNativeComponentViewProps::EdgeInsetsPropNativeComponentViewProps(
     const PropsParserContext &context,
@@ -174,8 +165,7 @@ EdgeInsetsPropNativeComponentViewProps::EdgeInsetsPropNativeComponentViewProps(
     
       {}
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -196,8 +186,7 @@ Object {
 #include <react/renderer/core/PropsParserContext.h>
 #include <react/renderer/core/propsConversions.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 EnumPropNativeComponentViewProps::EnumPropNativeComponentViewProps(
     const PropsParserContext &context,
@@ -208,8 +197,7 @@ EnumPropNativeComponentViewProps::EnumPropNativeComponentViewProps(
     intervals(convertRawProp(context, rawProps, \\"intervals\\", sourceProps.intervals, {EnumPropNativeComponentViewIntervals::Intervals0}))
       {}
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -230,8 +218,7 @@ Object {
 #include <react/renderer/core/PropsParserContext.h>
 #include <react/renderer/core/propsConversions.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 EventNestedObjectPropsNativeComponentViewProps::EventNestedObjectPropsNativeComponentViewProps(
     const PropsParserContext &context,
@@ -241,8 +228,7 @@ EventNestedObjectPropsNativeComponentViewProps::EventNestedObjectPropsNativeComp
     disabled(convertRawProp(context, rawProps, \\"disabled\\", sourceProps.disabled, {false}))
       {}
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -263,8 +249,7 @@ Object {
 #include <react/renderer/core/PropsParserContext.h>
 #include <react/renderer/core/propsConversions.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 EventPropsNativeComponentViewProps::EventPropsNativeComponentViewProps(
     const PropsParserContext &context,
@@ -274,8 +259,7 @@ EventPropsNativeComponentViewProps::EventPropsNativeComponentViewProps(
     disabled(convertRawProp(context, rawProps, \\"disabled\\", sourceProps.disabled, {false}))
       {}
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -296,8 +280,7 @@ Object {
 #include <react/renderer/core/PropsParserContext.h>
 #include <react/renderer/core/propsConversions.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 FloatPropsNativeComponentViewProps::FloatPropsNativeComponentViewProps(
     const PropsParserContext &context,
@@ -313,8 +296,7 @@ FloatPropsNativeComponentViewProps::FloatPropsNativeComponentViewProps(
     blurRadiusNullable(convertRawProp(context, rawProps, \\"blurRadiusNullable\\", sourceProps.blurRadiusNullable, {}))
       {}
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -336,8 +318,7 @@ Object {
 #include <react/renderer/core/PropsParserContext.h>
 #include <react/renderer/core/propsConversions.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 ImagePropNativeComponentViewProps::ImagePropNativeComponentViewProps(
     const PropsParserContext &context,
@@ -347,8 +328,7 @@ ImagePropNativeComponentViewProps::ImagePropNativeComponentViewProps(
     thumbImage(convertRawProp(context, rawProps, \\"thumbImage\\", sourceProps.thumbImage, {}))
       {}
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -369,8 +349,7 @@ Object {
 #include <react/renderer/core/PropsParserContext.h>
 #include <react/renderer/core/propsConversions.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 IntegerPropNativeComponentViewProps::IntegerPropNativeComponentViewProps(
     const PropsParserContext &context,
@@ -382,8 +361,7 @@ IntegerPropNativeComponentViewProps::IntegerPropNativeComponentViewProps(
     progress3(convertRawProp(context, rawProps, \\"progress3\\", sourceProps.progress3, {10}))
       {}
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -404,8 +382,7 @@ Object {
 #include <react/renderer/core/PropsParserContext.h>
 #include <react/renderer/core/propsConversions.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 InterfaceOnlyNativeComponentViewProps::InterfaceOnlyNativeComponentViewProps(
     const PropsParserContext &context,
@@ -415,8 +392,7 @@ InterfaceOnlyNativeComponentViewProps::InterfaceOnlyNativeComponentViewProps(
     title(convertRawProp(context, rawProps, \\"title\\", sourceProps.title, {\\"\\"}))
       {}
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -438,8 +414,7 @@ Object {
 #include <react/renderer/core/PropsParserContext.h>
 #include <react/renderer/core/propsConversions.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 MixedPropNativeComponentViewProps::MixedPropNativeComponentViewProps(
     const PropsParserContext &context,
@@ -449,8 +424,7 @@ MixedPropNativeComponentViewProps::MixedPropNativeComponentViewProps(
     mixedProp(convertRawProp(context, rawProps, \\"mixedProp\\", sourceProps.mixedProp, {}))
       {}
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -472,8 +446,7 @@ Object {
 #include <react/renderer/core/PropsParserContext.h>
 #include <react/renderer/core/propsConversions.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 MultiNativePropNativeComponentViewProps::MultiNativePropNativeComponentViewProps(
     const PropsParserContext &context,
@@ -486,8 +459,7 @@ MultiNativePropNativeComponentViewProps::MultiNativePropNativeComponentViewProps
     point(convertRawProp(context, rawProps, \\"point\\", sourceProps.point, {}))
       {}
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -508,8 +480,7 @@ Object {
 #include <react/renderer/core/PropsParserContext.h>
 #include <react/renderer/core/propsConversions.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 NoPropsNoEventsNativeComponentViewProps::NoPropsNoEventsNativeComponentViewProps(
     const PropsParserContext &context,
@@ -519,8 +490,7 @@ NoPropsNoEventsNativeComponentViewProps::NoPropsNoEventsNativeComponentViewProps
     
       {}
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -542,8 +512,7 @@ Object {
 #include <react/renderer/core/PropsParserContext.h>
 #include <react/renderer/core/propsConversions.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 ObjectPropsNativeComponentProps::ObjectPropsNativeComponentProps(
     const PropsParserContext &context,
@@ -555,8 +524,7 @@ ObjectPropsNativeComponentProps::ObjectPropsNativeComponentProps(
     objectPrimitiveRequiredProp(convertRawProp(context, rawProps, \\"objectPrimitiveRequiredProp\\", sourceProps.objectPrimitiveRequiredProp, {}))
       {}
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -577,8 +545,7 @@ Object {
 #include <react/renderer/core/PropsParserContext.h>
 #include <react/renderer/core/propsConversions.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 PointPropNativeComponentViewProps::PointPropNativeComponentViewProps(
     const PropsParserContext &context,
@@ -588,8 +555,7 @@ PointPropNativeComponentViewProps::PointPropNativeComponentViewProps(
     startPoint(convertRawProp(context, rawProps, \\"startPoint\\", sourceProps.startPoint, {}))
       {}
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -610,8 +576,7 @@ Object {
 #include <react/renderer/core/PropsParserContext.h>
 #include <react/renderer/core/propsConversions.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 StringPropNativeComponentViewProps::StringPropNativeComponentViewProps(
     const PropsParserContext &context,
@@ -622,8 +587,7 @@ StringPropNativeComponentViewProps::StringPropNativeComponentViewProps(
     defaultValue(convertRawProp(context, rawProps, \\"defaultValue\\", sourceProps.defaultValue, {}))
       {}
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
diff --git a/packages/react-native-codegen/e2e/__tests__/components/__snapshots__/GeneratePropsH-test.js.snap b/packages/react-native-codegen/e2e/__tests__/components/__snapshots__/GeneratePropsH-test.js.snap
index 83866b74863dfb..aaf1c130eafba2 100644
--- a/packages/react-native-codegen/e2e/__tests__/components/__snapshots__/GeneratePropsH-test.js.snap
+++ b/packages/react-native-codegen/e2e/__tests__/components/__snapshots__/GeneratePropsH-test.js.snap
@@ -24,8 +24,7 @@ Object {
 #include <vector>
 #include <yoga/Yoga.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 using ArrayPropsNativeComponentViewSizesMask = uint32_t;
 
@@ -161,8 +160,7 @@ class ArrayPropsNativeComponentViewProps final : public ViewProps {
   std::vector<ArrayPropsNativeComponentViewArrayOfObjectsStruct> arrayOfObjects{};
 };
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -183,8 +181,7 @@ Object {
 #include <react/renderer/components/view/ViewProps.h>
 #include <react/renderer/core/PropsParserContext.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 class BooleanPropNativeComponentViewProps final : public ViewProps {
  public:
@@ -197,8 +194,7 @@ class BooleanPropNativeComponentViewProps final : public ViewProps {
   bool disabledNullable{};
 };
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -220,8 +216,7 @@ Object {
 #include <react/renderer/core/PropsParserContext.h>
 #include <react/renderer/graphics/Color.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 class ColorPropNativeComponentViewProps final : public ViewProps {
  public:
@@ -233,8 +228,7 @@ class ColorPropNativeComponentViewProps final : public ViewProps {
   SharedColor tintColor{};
 };
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -256,8 +250,7 @@ Object {
 #include <react/renderer/core/PropsParserContext.h>
 #include <yoga/Yoga.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 class DimensionPropNativeComponentViewProps final : public ViewProps {
  public:
@@ -269,8 +262,7 @@ class DimensionPropNativeComponentViewProps final : public ViewProps {
   YGValue marginBack{};
 };
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -291,8 +283,7 @@ Object {
 #include <react/renderer/components/view/ViewProps.h>
 #include <react/renderer/core/PropsParserContext.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 class EdgeInsetsPropNativeComponentViewProps final : public ViewProps {
  public:
@@ -304,8 +295,7 @@ class EdgeInsetsPropNativeComponentViewProps final : public ViewProps {
   
 };
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -326,8 +316,7 @@ Object {
 #include <react/renderer/components/view/ViewProps.h>
 #include <react/renderer/core/PropsParserContext.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 enum class EnumPropNativeComponentViewAlignment { Top, Center, BottomRight };
 
@@ -388,8 +377,7 @@ class EnumPropNativeComponentViewProps final : public ViewProps {
   EnumPropNativeComponentViewIntervals intervals{EnumPropNativeComponentViewIntervals::Intervals0};
 };
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -410,8 +398,7 @@ Object {
 #include <react/renderer/components/view/ViewProps.h>
 #include <react/renderer/core/PropsParserContext.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 class EventNestedObjectPropsNativeComponentViewProps final : public ViewProps {
  public:
@@ -423,8 +410,7 @@ class EventNestedObjectPropsNativeComponentViewProps final : public ViewProps {
   bool disabled{false};
 };
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -445,8 +431,7 @@ Object {
 #include <react/renderer/components/view/ViewProps.h>
 #include <react/renderer/core/PropsParserContext.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 class EventPropsNativeComponentViewProps final : public ViewProps {
  public:
@@ -458,8 +443,7 @@ class EventPropsNativeComponentViewProps final : public ViewProps {
   bool disabled{false};
 };
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -480,8 +464,7 @@ Object {
 #include <react/renderer/components/view/ViewProps.h>
 #include <react/renderer/core/PropsParserContext.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 class FloatPropsNativeComponentViewProps final : public ViewProps {
  public:
@@ -499,8 +482,7 @@ class FloatPropsNativeComponentViewProps final : public ViewProps {
   Float blurRadiusNullable{};
 };
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -522,8 +504,7 @@ Object {
 #include <react/renderer/core/PropsParserContext.h>
 #include <react/renderer/imagemanager/primitives.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 class ImagePropNativeComponentViewProps final : public ViewProps {
  public:
@@ -535,8 +516,7 @@ class ImagePropNativeComponentViewProps final : public ViewProps {
   ImageSource thumbImage{};
 };
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -557,8 +537,7 @@ Object {
 #include <react/renderer/components/view/ViewProps.h>
 #include <react/renderer/core/PropsParserContext.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 class IntegerPropNativeComponentViewProps final : public ViewProps {
  public:
@@ -572,8 +551,7 @@ class IntegerPropNativeComponentViewProps final : public ViewProps {
   int progress3{10};
 };
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -594,8 +572,7 @@ Object {
 #include <react/renderer/components/view/ViewProps.h>
 #include <react/renderer/core/PropsParserContext.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 class InterfaceOnlyNativeComponentViewProps final : public ViewProps {
  public:
@@ -607,8 +584,7 @@ class InterfaceOnlyNativeComponentViewProps final : public ViewProps {
   std::string title{\\"\\"};
 };
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -629,8 +605,7 @@ Object {
 #include <react/renderer/components/view/ViewProps.h>
 #include <react/renderer/core/PropsParserContext.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 class MixedPropNativeComponentViewProps final : public ViewProps {
  public:
@@ -642,8 +617,7 @@ class MixedPropNativeComponentViewProps final : public ViewProps {
   folly::dynamic mixedProp{};
 };
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -667,8 +641,7 @@ Object {
 #include <react/renderer/graphics/Point.h>
 #include <react/renderer/imagemanager/primitives.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 class MultiNativePropNativeComponentViewProps final : public ViewProps {
  public:
@@ -683,8 +656,7 @@ class MultiNativePropNativeComponentViewProps final : public ViewProps {
   Point point{};
 };
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -705,8 +677,7 @@ Object {
 #include <react/renderer/components/view/ViewProps.h>
 #include <react/renderer/core/PropsParserContext.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 class NoPropsNoEventsNativeComponentViewProps final : public ViewProps {
  public:
@@ -718,8 +689,7 @@ class NoPropsNoEventsNativeComponentViewProps final : public ViewProps {
   
 };
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -746,8 +716,7 @@ Object {
 #include <react/renderer/imagemanager/primitives.h>
 #include <vector>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 enum class ObjectPropsNativeComponentStringEnumProp { Small, Large };
 
@@ -883,8 +852,7 @@ class ObjectPropsNativeComponentProps final : public ViewProps {
   ObjectPropsNativeComponentObjectPrimitiveRequiredPropStruct objectPrimitiveRequiredProp{};
 };
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -906,8 +874,7 @@ Object {
 #include <react/renderer/core/PropsParserContext.h>
 #include <react/renderer/graphics/Point.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 class PointPropNativeComponentViewProps final : public ViewProps {
  public:
@@ -919,8 +886,7 @@ class PointPropNativeComponentViewProps final : public ViewProps {
   Point startPoint{};
 };
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -941,8 +907,7 @@ Object {
 #include <react/renderer/components/view/ViewProps.h>
 #include <react/renderer/core/PropsParserContext.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 class StringPropNativeComponentViewProps final : public ViewProps {
  public:
@@ -955,8 +920,7 @@ class StringPropNativeComponentViewProps final : public ViewProps {
   std::string defaultValue{};
 };
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
diff --git a/packages/react-native-codegen/e2e/__tests__/components/__snapshots__/GenerateShadowNodeCpp-test.js.snap b/packages/react-native-codegen/e2e/__tests__/components/__snapshots__/GenerateShadowNodeCpp-test.js.snap
index 224a02cc2ca754..71b984b27fe467 100644
--- a/packages/react-native-codegen/e2e/__tests__/components/__snapshots__/GenerateShadowNodeCpp-test.js.snap
+++ b/packages/react-native-codegen/e2e/__tests__/components/__snapshots__/GenerateShadowNodeCpp-test.js.snap
@@ -14,13 +14,11 @@ Object {
 
 #include <react/renderer/components/RNCodegenModuleFixtures/ShadowNodes.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 extern const char ArrayPropsNativeComponentViewComponentName[] = \\"ArrayPropsNativeComponentView\\";
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -39,13 +37,11 @@ Object {
 
 #include <react/renderer/components/RNCodegenModuleFixtures/ShadowNodes.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 extern const char BooleanPropNativeComponentViewComponentName[] = \\"BooleanPropNativeComponentView\\";
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -64,13 +60,11 @@ Object {
 
 #include <react/renderer/components/RNCodegenModuleFixtures/ShadowNodes.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 extern const char ColorPropNativeComponentViewComponentName[] = \\"ColorPropNativeComponentView\\";
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -89,13 +83,11 @@ Object {
 
 #include <react/renderer/components/RNCodegenModuleFixtures/ShadowNodes.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 extern const char DimensionPropNativeComponentViewComponentName[] = \\"DimensionPropNativeComponentView\\";
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -114,13 +106,11 @@ Object {
 
 #include <react/renderer/components/RNCodegenModuleFixtures/ShadowNodes.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 extern const char EdgeInsetsPropNativeComponentViewComponentName[] = \\"EdgeInsetsPropNativeComponentView\\";
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -139,13 +129,11 @@ Object {
 
 #include <react/renderer/components/RNCodegenModuleFixtures/ShadowNodes.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 extern const char EnumPropNativeComponentViewComponentName[] = \\"EnumPropNativeComponentView\\";
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -164,13 +152,11 @@ Object {
 
 #include <react/renderer/components/RNCodegenModuleFixtures/ShadowNodes.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 extern const char EventNestedObjectPropsNativeComponentViewComponentName[] = \\"EventNestedObjectPropsNativeComponentView\\";
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -189,13 +175,11 @@ Object {
 
 #include <react/renderer/components/RNCodegenModuleFixtures/ShadowNodes.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 extern const char EventPropsNativeComponentViewComponentName[] = \\"EventPropsNativeComponentView\\";
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -214,13 +198,11 @@ Object {
 
 #include <react/renderer/components/RNCodegenModuleFixtures/ShadowNodes.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 extern const char FloatPropsNativeComponentViewComponentName[] = \\"FloatPropsNativeComponentView\\";
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -239,13 +221,11 @@ Object {
 
 #include <react/renderer/components/RNCodegenModuleFixtures/ShadowNodes.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 extern const char ImagePropNativeComponentViewComponentName[] = \\"ImagePropNativeComponentView\\";
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -264,13 +244,11 @@ Object {
 
 #include <react/renderer/components/RNCodegenModuleFixtures/ShadowNodes.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 extern const char IntegerPropNativeComponentViewComponentName[] = \\"IntegerPropNativeComponentView\\";
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -289,13 +267,11 @@ Object {
 
 #include <react/renderer/components/RNCodegenModuleFixtures/ShadowNodes.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -314,13 +290,11 @@ Object {
 
 #include <react/renderer/components/RNCodegenModuleFixtures/ShadowNodes.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 extern const char MixedPropNativeComponentViewComponentName[] = \\"MixedPropNativeComponentView\\";
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -339,13 +313,11 @@ Object {
 
 #include <react/renderer/components/RNCodegenModuleFixtures/ShadowNodes.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 extern const char MultiNativePropNativeComponentViewComponentName[] = \\"MultiNativePropNativeComponentView\\";
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -364,13 +336,11 @@ Object {
 
 #include <react/renderer/components/RNCodegenModuleFixtures/ShadowNodes.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 extern const char NoPropsNoEventsNativeComponentViewComponentName[] = \\"NoPropsNoEventsNativeComponentView\\";
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -389,13 +359,11 @@ Object {
 
 #include <react/renderer/components/RNCodegenModuleFixtures/ShadowNodes.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 extern const char ObjectPropsNativeComponentComponentName[] = \\"ObjectPropsNativeComponent\\";
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -414,13 +382,11 @@ Object {
 
 #include <react/renderer/components/RNCodegenModuleFixtures/ShadowNodes.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 extern const char PointPropNativeComponentViewComponentName[] = \\"PointPropNativeComponentView\\";
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -439,13 +405,11 @@ Object {
 
 #include <react/renderer/components/RNCodegenModuleFixtures/ShadowNodes.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 extern const char StringPropNativeComponentViewComponentName[] = \\"StringPropNativeComponentView\\";
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
diff --git a/packages/react-native-codegen/e2e/__tests__/components/__snapshots__/GenerateShadowNodeH-test.js.snap b/packages/react-native-codegen/e2e/__tests__/components/__snapshots__/GenerateShadowNodeH-test.js.snap
index d4d33cc34ad983..0d9839e13568ea 100644
--- a/packages/react-native-codegen/e2e/__tests__/components/__snapshots__/GenerateShadowNodeH-test.js.snap
+++ b/packages/react-native-codegen/e2e/__tests__/components/__snapshots__/GenerateShadowNodeH-test.js.snap
@@ -20,8 +20,7 @@ Object {
 #include <react/renderer/components/view/ConcreteViewShadowNode.h>
 #include <jsi/jsi.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 JSI_EXPORT extern const char ArrayPropsNativeComponentViewComponentName[];
 
@@ -34,8 +33,7 @@ using ArrayPropsNativeComponentViewShadowNode = ConcreteViewShadowNode<
     ArrayPropsNativeComponentViewEventEmitter,
     ArrayPropsNativeComponentViewState>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -60,8 +58,7 @@ Object {
 #include <react/renderer/components/view/ConcreteViewShadowNode.h>
 #include <jsi/jsi.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 JSI_EXPORT extern const char BooleanPropNativeComponentViewComponentName[];
 
@@ -74,8 +71,7 @@ using BooleanPropNativeComponentViewShadowNode = ConcreteViewShadowNode<
     BooleanPropNativeComponentViewEventEmitter,
     BooleanPropNativeComponentViewState>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -100,8 +96,7 @@ Object {
 #include <react/renderer/components/view/ConcreteViewShadowNode.h>
 #include <jsi/jsi.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 JSI_EXPORT extern const char ColorPropNativeComponentViewComponentName[];
 
@@ -114,8 +109,7 @@ using ColorPropNativeComponentViewShadowNode = ConcreteViewShadowNode<
     ColorPropNativeComponentViewEventEmitter,
     ColorPropNativeComponentViewState>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -140,8 +134,7 @@ Object {
 #include <react/renderer/components/view/ConcreteViewShadowNode.h>
 #include <jsi/jsi.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 JSI_EXPORT extern const char DimensionPropNativeComponentViewComponentName[];
 
@@ -154,8 +147,7 @@ using DimensionPropNativeComponentViewShadowNode = ConcreteViewShadowNode<
     DimensionPropNativeComponentViewEventEmitter,
     DimensionPropNativeComponentViewState>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -180,8 +172,7 @@ Object {
 #include <react/renderer/components/view/ConcreteViewShadowNode.h>
 #include <jsi/jsi.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 JSI_EXPORT extern const char EdgeInsetsPropNativeComponentViewComponentName[];
 
@@ -194,8 +185,7 @@ using EdgeInsetsPropNativeComponentViewShadowNode = ConcreteViewShadowNode<
     EdgeInsetsPropNativeComponentViewEventEmitter,
     EdgeInsetsPropNativeComponentViewState>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -220,8 +210,7 @@ Object {
 #include <react/renderer/components/view/ConcreteViewShadowNode.h>
 #include <jsi/jsi.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 JSI_EXPORT extern const char EnumPropNativeComponentViewComponentName[];
 
@@ -234,8 +223,7 @@ using EnumPropNativeComponentViewShadowNode = ConcreteViewShadowNode<
     EnumPropNativeComponentViewEventEmitter,
     EnumPropNativeComponentViewState>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -260,8 +248,7 @@ Object {
 #include <react/renderer/components/view/ConcreteViewShadowNode.h>
 #include <jsi/jsi.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 JSI_EXPORT extern const char EventNestedObjectPropsNativeComponentViewComponentName[];
 
@@ -274,8 +261,7 @@ using EventNestedObjectPropsNativeComponentViewShadowNode = ConcreteViewShadowNo
     EventNestedObjectPropsNativeComponentViewEventEmitter,
     EventNestedObjectPropsNativeComponentViewState>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -300,8 +286,7 @@ Object {
 #include <react/renderer/components/view/ConcreteViewShadowNode.h>
 #include <jsi/jsi.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 JSI_EXPORT extern const char EventPropsNativeComponentViewComponentName[];
 
@@ -314,8 +299,7 @@ using EventPropsNativeComponentViewShadowNode = ConcreteViewShadowNode<
     EventPropsNativeComponentViewEventEmitter,
     EventPropsNativeComponentViewState>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -340,8 +324,7 @@ Object {
 #include <react/renderer/components/view/ConcreteViewShadowNode.h>
 #include <jsi/jsi.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 JSI_EXPORT extern const char FloatPropsNativeComponentViewComponentName[];
 
@@ -354,8 +337,7 @@ using FloatPropsNativeComponentViewShadowNode = ConcreteViewShadowNode<
     FloatPropsNativeComponentViewEventEmitter,
     FloatPropsNativeComponentViewState>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -380,8 +362,7 @@ Object {
 #include <react/renderer/components/view/ConcreteViewShadowNode.h>
 #include <jsi/jsi.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 JSI_EXPORT extern const char ImagePropNativeComponentViewComponentName[];
 
@@ -394,8 +375,7 @@ using ImagePropNativeComponentViewShadowNode = ConcreteViewShadowNode<
     ImagePropNativeComponentViewEventEmitter,
     ImagePropNativeComponentViewState>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -420,8 +400,7 @@ Object {
 #include <react/renderer/components/view/ConcreteViewShadowNode.h>
 #include <jsi/jsi.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 JSI_EXPORT extern const char IntegerPropNativeComponentViewComponentName[];
 
@@ -434,8 +413,7 @@ using IntegerPropNativeComponentViewShadowNode = ConcreteViewShadowNode<
     IntegerPropNativeComponentViewEventEmitter,
     IntegerPropNativeComponentViewState>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -460,13 +438,11 @@ Object {
 #include <react/renderer/components/view/ConcreteViewShadowNode.h>
 #include <jsi/jsi.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -491,8 +467,7 @@ Object {
 #include <react/renderer/components/view/ConcreteViewShadowNode.h>
 #include <jsi/jsi.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 JSI_EXPORT extern const char MixedPropNativeComponentViewComponentName[];
 
@@ -505,8 +480,7 @@ using MixedPropNativeComponentViewShadowNode = ConcreteViewShadowNode<
     MixedPropNativeComponentViewEventEmitter,
     MixedPropNativeComponentViewState>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -531,8 +505,7 @@ Object {
 #include <react/renderer/components/view/ConcreteViewShadowNode.h>
 #include <jsi/jsi.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 JSI_EXPORT extern const char MultiNativePropNativeComponentViewComponentName[];
 
@@ -545,8 +518,7 @@ using MultiNativePropNativeComponentViewShadowNode = ConcreteViewShadowNode<
     MultiNativePropNativeComponentViewEventEmitter,
     MultiNativePropNativeComponentViewState>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -571,8 +543,7 @@ Object {
 #include <react/renderer/components/view/ConcreteViewShadowNode.h>
 #include <jsi/jsi.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 JSI_EXPORT extern const char NoPropsNoEventsNativeComponentViewComponentName[];
 
@@ -585,8 +556,7 @@ using NoPropsNoEventsNativeComponentViewShadowNode = ConcreteViewShadowNode<
     NoPropsNoEventsNativeComponentViewEventEmitter,
     NoPropsNoEventsNativeComponentViewState>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -611,8 +581,7 @@ Object {
 #include <react/renderer/components/view/ConcreteViewShadowNode.h>
 #include <jsi/jsi.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 JSI_EXPORT extern const char ObjectPropsNativeComponentComponentName[];
 
@@ -625,8 +594,7 @@ using ObjectPropsNativeComponentShadowNode = ConcreteViewShadowNode<
     ObjectPropsNativeComponentEventEmitter,
     ObjectPropsNativeComponentState>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -651,8 +619,7 @@ Object {
 #include <react/renderer/components/view/ConcreteViewShadowNode.h>
 #include <jsi/jsi.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 JSI_EXPORT extern const char PointPropNativeComponentViewComponentName[];
 
@@ -665,8 +632,7 @@ using PointPropNativeComponentViewShadowNode = ConcreteViewShadowNode<
     PointPropNativeComponentViewEventEmitter,
     PointPropNativeComponentViewState>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -691,8 +657,7 @@ Object {
 #include <react/renderer/components/view/ConcreteViewShadowNode.h>
 #include <jsi/jsi.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 JSI_EXPORT extern const char StringPropNativeComponentViewComponentName[];
 
@@ -705,8 +670,7 @@ using StringPropNativeComponentViewShadowNode = ConcreteViewShadowNode<
     StringPropNativeComponentViewEventEmitter,
     StringPropNativeComponentViewState>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
diff --git a/packages/react-native-codegen/src/generators/components/GenerateComponentDescriptorH.js b/packages/react-native-codegen/src/generators/components/GenerateComponentDescriptorH.js
index a7c795622f9082..542aac11fee046 100644
--- a/packages/react-native-codegen/src/generators/components/GenerateComponentDescriptorH.js
+++ b/packages/react-native-codegen/src/generators/components/GenerateComponentDescriptorH.js
@@ -36,13 +36,11 @@ const FileTemplate = ({
 #include <react/renderer/components/${libraryName}/ShadowNodes.h>
 #include <react/renderer/core/ConcreteComponentDescriptor.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 ${componentDescriptors}
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 `;
 
 const ComponentTemplate = ({className}: {className: string}) =>
diff --git a/packages/react-native-codegen/src/generators/components/GenerateEventEmitterCpp.js b/packages/react-native-codegen/src/generators/components/GenerateEventEmitterCpp.js
index db983558403aeb..49d877981a413e 100644
--- a/packages/react-native-codegen/src/generators/components/GenerateEventEmitterCpp.js
+++ b/packages/react-native-codegen/src/generators/components/GenerateEventEmitterCpp.js
@@ -50,11 +50,9 @@ const FileTemplate = ({
 #include <react/renderer/components/${libraryName}/EventEmitters.h>
 ${[...extraIncludes].join('\n')}
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 ${events}
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 `;
 
 const ComponentTemplate = ({
diff --git a/packages/react-native-codegen/src/generators/components/GenerateEventEmitterH.js b/packages/react-native-codegen/src/generators/components/GenerateEventEmitterH.js
index 5a1bf13b97b187..ca3f35f92da6af 100644
--- a/packages/react-native-codegen/src/generators/components/GenerateEventEmitterH.js
+++ b/packages/react-native-codegen/src/generators/components/GenerateEventEmitterH.js
@@ -56,11 +56,9 @@ const FileTemplate = ({
 #include <react/renderer/components/view/ViewEventEmitter.h>
 ${[...extraIncludes].join('\n')}
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 ${componentEmitters}
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 `;
 
 const ComponentTemplate = ({
diff --git a/packages/react-native-codegen/src/generators/components/GeneratePropsCpp.js b/packages/react-native-codegen/src/generators/components/GeneratePropsCpp.js
index d809193a723c26..77e0b7deed5b7a 100644
--- a/packages/react-native-codegen/src/generators/components/GeneratePropsCpp.js
+++ b/packages/react-native-codegen/src/generators/components/GeneratePropsCpp.js
@@ -38,13 +38,11 @@ const FileTemplate = ({
 #include <react/renderer/components/${libraryName}/Props.h>
 ${imports}
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 ${componentClasses}
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 `;
 
 const ComponentTemplate = ({
diff --git a/packages/react-native-codegen/src/generators/components/GeneratePropsH.js b/packages/react-native-codegen/src/generators/components/GeneratePropsH.js
index 0ec54ced1a48d1..f2a71e3ee84e61 100644
--- a/packages/react-native-codegen/src/generators/components/GeneratePropsH.js
+++ b/packages/react-native-codegen/src/generators/components/GeneratePropsH.js
@@ -52,13 +52,11 @@ const FileTemplate = ({
 
 ${imports}
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 ${componentClasses}
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 `;
 
 const ClassTemplate = ({
diff --git a/packages/react-native-codegen/src/generators/components/GenerateShadowNodeCpp.js b/packages/react-native-codegen/src/generators/components/GenerateShadowNodeCpp.js
index 82cb8ffd5ab559..8a595988309f4a 100644
--- a/packages/react-native-codegen/src/generators/components/GenerateShadowNodeCpp.js
+++ b/packages/react-native-codegen/src/generators/components/GenerateShadowNodeCpp.js
@@ -33,13 +33,11 @@ const FileTemplate = ({
 
 #include <react/renderer/components/${libraryName}/ShadowNodes.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 ${componentNames}
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 `;
 
 const ComponentTemplate = ({className}: {className: string}) =>
diff --git a/packages/react-native-codegen/src/generators/components/GenerateShadowNodeH.js b/packages/react-native-codegen/src/generators/components/GenerateShadowNodeH.js
index 3e7cf71117ef22..b2d3c047c341a9 100644
--- a/packages/react-native-codegen/src/generators/components/GenerateShadowNodeH.js
+++ b/packages/react-native-codegen/src/generators/components/GenerateShadowNodeH.js
@@ -40,13 +40,11 @@ ${imports}#include <react/renderer/components/${libraryName}/Props.h>
 #include <react/renderer/components/view/ConcreteViewShadowNode.h>
 #include <jsi/jsi.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 ${componentClasses}
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 `;
 
 const ComponentTemplate = ({
diff --git a/packages/react-native-codegen/src/generators/components/GenerateStateCpp.js b/packages/react-native-codegen/src/generators/components/GenerateStateCpp.js
index 36c84339819207..2c280eaf51b441 100644
--- a/packages/react-native-codegen/src/generators/components/GenerateStateCpp.js
+++ b/packages/react-native-codegen/src/generators/components/GenerateStateCpp.js
@@ -32,13 +32,11 @@ const FileTemplate = ({
  */
 #include <react/renderer/components/${libraryName}/States.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 ${stateClasses}
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 `;
 
 const StateTemplate = ({stateName}: {stateName: string}) => '';
diff --git a/packages/react-native-codegen/src/generators/components/GenerateStateH.js b/packages/react-native-codegen/src/generators/components/GenerateStateH.js
index 658142eaea04eb..9910c83aa05abc 100644
--- a/packages/react-native-codegen/src/generators/components/GenerateStateH.js
+++ b/packages/react-native-codegen/src/generators/components/GenerateStateH.js
@@ -39,13 +39,11 @@ const FileTemplate = ({
 #include <react/renderer/mapbuffer/MapBufferBuilder.h>
 #endif
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 ${stateClasses}
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 `.trim();
 
 const StateTemplate = ({stateName}: {stateName: string}) =>
diff --git a/packages/react-native-codegen/src/generators/components/__tests__/__snapshots__/GenerateComponentDescriptorH-test.js.snap b/packages/react-native-codegen/src/generators/components/__tests__/__snapshots__/GenerateComponentDescriptorH-test.js.snap
index 72653d4c56f282..7f55bcf5d714e1 100644
--- a/packages/react-native-codegen/src/generators/components/__tests__/__snapshots__/GenerateComponentDescriptorH-test.js.snap
+++ b/packages/react-native-codegen/src/generators/components/__tests__/__snapshots__/GenerateComponentDescriptorH-test.js.snap
@@ -17,13 +17,11 @@ Map {
 #include <react/renderer/components/ARRAY_PROPS/ShadowNodes.h>
 #include <react/renderer/core/ConcreteComponentDescriptor.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 using ArrayPropsNativeComponentComponentDescriptor = ConcreteComponentDescriptor<ArrayPropsNativeComponentShadowNode>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -45,13 +43,11 @@ Map {
 #include <react/renderer/components/ARRAY_PROPS_WITH_NESTED_OBJECT/ShadowNodes.h>
 #include <react/renderer/core/ConcreteComponentDescriptor.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 using ArrayPropsNativeComponentComponentDescriptor = ConcreteComponentDescriptor<ArrayPropsNativeComponentShadowNode>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -73,13 +69,11 @@ Map {
 #include <react/renderer/components/BOOLEAN_PROP/ShadowNodes.h>
 #include <react/renderer/core/ConcreteComponentDescriptor.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 using BooleanPropNativeComponentComponentDescriptor = ConcreteComponentDescriptor<BooleanPropNativeComponentShadowNode>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -101,13 +95,11 @@ Map {
 #include <react/renderer/components/COLOR_PROP/ShadowNodes.h>
 #include <react/renderer/core/ConcreteComponentDescriptor.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 using ColorPropNativeComponentComponentDescriptor = ConcreteComponentDescriptor<ColorPropNativeComponentShadowNode>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -129,13 +121,11 @@ Map {
 #include <react/renderer/components/COMMANDS/ShadowNodes.h>
 #include <react/renderer/core/ConcreteComponentDescriptor.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 using CommandNativeComponentComponentDescriptor = ConcreteComponentDescriptor<CommandNativeComponentShadowNode>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -157,13 +147,11 @@ Map {
 #include <react/renderer/components/COMMANDS_AND_PROPS/ShadowNodes.h>
 #include <react/renderer/core/ConcreteComponentDescriptor.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 using CommandNativeComponentComponentDescriptor = ConcreteComponentDescriptor<CommandNativeComponentShadowNode>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -185,13 +173,11 @@ Map {
 #include <react/renderer/components/DIMENSION_PROP/ShadowNodes.h>
 #include <react/renderer/core/ConcreteComponentDescriptor.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 using DimensionPropNativeComponentComponentDescriptor = ConcreteComponentDescriptor<DimensionPropNativeComponentShadowNode>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -213,13 +199,11 @@ Map {
 #include <react/renderer/components/DOUBLE_PROPS/ShadowNodes.h>
 #include <react/renderer/core/ConcreteComponentDescriptor.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 using DoublePropNativeComponentComponentDescriptor = ConcreteComponentDescriptor<DoublePropNativeComponentShadowNode>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -241,13 +225,11 @@ Map {
 #include <react/renderer/components/EVENT_NESTED_OBJECT_PROPS/ShadowNodes.h>
 #include <react/renderer/core/ConcreteComponentDescriptor.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 using EventsNestedObjectNativeComponentComponentDescriptor = ConcreteComponentDescriptor<EventsNestedObjectNativeComponentShadowNode>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -269,13 +251,11 @@ Map {
 #include <react/renderer/components/EVENT_PROPS/ShadowNodes.h>
 #include <react/renderer/core/ConcreteComponentDescriptor.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 using EventsNativeComponentComponentDescriptor = ConcreteComponentDescriptor<EventsNativeComponentShadowNode>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -297,13 +277,11 @@ Map {
 #include <react/renderer/components/EVENTS_WITH_PAPER_NAME/ShadowNodes.h>
 #include <react/renderer/core/ConcreteComponentDescriptor.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -325,13 +303,11 @@ Map {
 #include <react/renderer/components/EXCLUDE_ANDROID/ShadowNodes.h>
 #include <react/renderer/core/ConcreteComponentDescriptor.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 using ExcludedAndroidComponentComponentDescriptor = ConcreteComponentDescriptor<ExcludedAndroidComponentShadowNode>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -353,13 +329,11 @@ Map {
 #include <react/renderer/components/EXCLUDE_ANDROID_IOS/ShadowNodes.h>
 #include <react/renderer/core/ConcreteComponentDescriptor.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 using ExcludedAndroidIosComponentComponentDescriptor = ConcreteComponentDescriptor<ExcludedAndroidIosComponentShadowNode>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -381,14 +355,12 @@ Map {
 #include <react/renderer/components/EXCLUDE_IOS_TWO_COMPONENTS_DIFFERENT_FILES/ShadowNodes.h>
 #include <react/renderer/core/ConcreteComponentDescriptor.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 using ExcludedIosComponentComponentDescriptor = ConcreteComponentDescriptor<ExcludedIosComponentShadowNode>;
 using MultiFileIncludedNativeComponentComponentDescriptor = ConcreteComponentDescriptor<MultiFileIncludedNativeComponentShadowNode>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -410,13 +382,11 @@ Map {
 #include <react/renderer/components/FLOAT_PROPS/ShadowNodes.h>
 #include <react/renderer/core/ConcreteComponentDescriptor.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 using FloatPropNativeComponentComponentDescriptor = ConcreteComponentDescriptor<FloatPropNativeComponentShadowNode>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -438,13 +408,11 @@ Map {
 #include <react/renderer/components/IMAGE_PROP/ShadowNodes.h>
 #include <react/renderer/core/ConcreteComponentDescriptor.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 using ImagePropNativeComponentComponentDescriptor = ConcreteComponentDescriptor<ImagePropNativeComponentShadowNode>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -466,13 +434,11 @@ Map {
 #include <react/renderer/components/INSETS_PROP/ShadowNodes.h>
 #include <react/renderer/core/ConcreteComponentDescriptor.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 using InsetsPropNativeComponentComponentDescriptor = ConcreteComponentDescriptor<InsetsPropNativeComponentShadowNode>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -494,13 +460,11 @@ Map {
 #include <react/renderer/components/INT32_ENUM_PROP/ShadowNodes.h>
 #include <react/renderer/core/ConcreteComponentDescriptor.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 using Int32EnumPropsNativeComponentComponentDescriptor = ConcreteComponentDescriptor<Int32EnumPropsNativeComponentShadowNode>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -522,13 +486,11 @@ Map {
 #include <react/renderer/components/INTEGER_PROPS/ShadowNodes.h>
 #include <react/renderer/core/ConcreteComponentDescriptor.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 using IntegerPropNativeComponentComponentDescriptor = ConcreteComponentDescriptor<IntegerPropNativeComponentShadowNode>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -550,13 +512,11 @@ Map {
 #include <react/renderer/components/INTERFACE_ONLY/ShadowNodes.h>
 #include <react/renderer/core/ConcreteComponentDescriptor.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -578,13 +538,11 @@ Map {
 #include <react/renderer/components/MIXED_PROP/ShadowNodes.h>
 #include <react/renderer/core/ConcreteComponentDescriptor.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 using MixedPropNativeComponentComponentDescriptor = ConcreteComponentDescriptor<MixedPropNativeComponentShadowNode>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -606,13 +564,11 @@ Map {
 #include <react/renderer/components/MULTI_NATIVE_PROP/ShadowNodes.h>
 #include <react/renderer/core/ConcreteComponentDescriptor.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 using ImageColorPropNativeComponentComponentDescriptor = ConcreteComponentDescriptor<ImageColorPropNativeComponentShadowNode>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -634,13 +590,11 @@ Map {
 #include <react/renderer/components/NO_PROPS_NO_EVENTS/ShadowNodes.h>
 #include <react/renderer/core/ConcreteComponentDescriptor.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 using NoPropsNoEventsComponentComponentDescriptor = ConcreteComponentDescriptor<NoPropsNoEventsComponentShadowNode>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -662,13 +616,11 @@ Map {
 #include <react/renderer/components/OBJECT_PROPS/ShadowNodes.h>
 #include <react/renderer/core/ConcreteComponentDescriptor.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 using ObjectPropsComponentDescriptor = ConcreteComponentDescriptor<ObjectPropsShadowNode>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -690,13 +642,11 @@ Map {
 #include <react/renderer/components/POINT_PROP/ShadowNodes.h>
 #include <react/renderer/core/ConcreteComponentDescriptor.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 using PointPropNativeComponentComponentDescriptor = ConcreteComponentDescriptor<PointPropNativeComponentShadowNode>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -718,13 +668,11 @@ Map {
 #include <react/renderer/components/STRING_ENUM_PROP/ShadowNodes.h>
 #include <react/renderer/core/ConcreteComponentDescriptor.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 using StringEnumPropsNativeComponentComponentDescriptor = ConcreteComponentDescriptor<StringEnumPropsNativeComponentShadowNode>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -746,13 +694,11 @@ Map {
 #include <react/renderer/components/STRING_PROP/ShadowNodes.h>
 #include <react/renderer/core/ConcreteComponentDescriptor.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 using StringPropComponentComponentDescriptor = ConcreteComponentDescriptor<StringPropComponentShadowNode>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -774,14 +720,12 @@ Map {
 #include <react/renderer/components/TWO_COMPONENTS_DIFFERENT_FILES/ShadowNodes.h>
 #include <react/renderer/core/ConcreteComponentDescriptor.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 using MultiFile1NativeComponentComponentDescriptor = ConcreteComponentDescriptor<MultiFile1NativeComponentShadowNode>;
 using MultiFile2NativeComponentComponentDescriptor = ConcreteComponentDescriptor<MultiFile2NativeComponentShadowNode>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -803,14 +747,12 @@ Map {
 #include <react/renderer/components/TWO_COMPONENTS_SAME_FILE/ShadowNodes.h>
 #include <react/renderer/core/ConcreteComponentDescriptor.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 using MultiComponent1NativeComponentComponentDescriptor = ConcreteComponentDescriptor<MultiComponent1NativeComponentShadowNode>;
 using MultiComponent2NativeComponentComponentDescriptor = ConcreteComponentDescriptor<MultiComponent2NativeComponentShadowNode>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
diff --git a/packages/react-native-codegen/src/generators/components/__tests__/__snapshots__/GenerateEventEmitterCpp-test.js.snap b/packages/react-native-codegen/src/generators/components/__tests__/__snapshots__/GenerateEventEmitterCpp-test.js.snap
index 2ec6051506eab0..57a82be1187497 100644
--- a/packages/react-native-codegen/src/generators/components/__tests__/__snapshots__/GenerateEventEmitterCpp-test.js.snap
+++ b/packages/react-native-codegen/src/generators/components/__tests__/__snapshots__/GenerateEventEmitterCpp-test.js.snap
@@ -15,11 +15,9 @@ Map {
 #include <react/renderer/components/ARRAY_PROPS/EventEmitters.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -39,11 +37,9 @@ Map {
 #include <react/renderer/components/ARRAY_PROPS_WITH_NESTED_OBJECT/EventEmitters.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -63,11 +59,9 @@ Map {
 #include <react/renderer/components/BOOLEAN_PROP/EventEmitters.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -87,11 +81,9 @@ Map {
 #include <react/renderer/components/COLOR_PROP/EventEmitters.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -111,11 +103,9 @@ Map {
 #include <react/renderer/components/COMMANDS/EventEmitters.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -135,11 +125,9 @@ Map {
 #include <react/renderer/components/COMMANDS_AND_PROPS/EventEmitters.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -159,11 +147,9 @@ Map {
 #include <react/renderer/components/DIMENSION_PROP/EventEmitters.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -183,11 +169,9 @@ Map {
 #include <react/renderer/components/DOUBLE_PROPS/EventEmitters.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -207,8 +191,7 @@ Map {
 #include <react/renderer/components/EVENT_NESTED_OBJECT_PROPS/EventEmitters.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 void EventsNestedObjectNativeComponentEventEmitter::onChange(OnChange $event) const {
   dispatchEvent(\\"change\\", [$event=std::move($event)](jsi::Runtime &runtime) {
@@ -228,8 +211,7 @@ void EventsNestedObjectNativeComponentEventEmitter::onChange(OnChange $event) co
   });
 }
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -249,8 +231,7 @@ Map {
 #include <react/renderer/components/EVENT_PROPS/EventEmitters.h>
 #include <jsi/JSIDynamic.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 void EventsNativeComponentEventEmitter::onChange(OnChange $event) const {
   dispatchEvent(\\"change\\", [$event=std::move($event)](jsi::Runtime &runtime) {
@@ -357,8 +338,7 @@ void EventsNativeComponentEventEmitter::onEventWithMixedPropAttribute(OnEventWit
   });
 }
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -378,8 +358,7 @@ Map {
 #include <react/renderer/components/EVENTS_WITH_PAPER_NAME/EventEmitters.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 void InterfaceOnlyComponentEventEmitter::onChange(OnChange $event) const {
   dispatchEvent(\\"change\\", [$event=std::move($event)](jsi::Runtime &runtime) {
@@ -398,8 +377,7 @@ void InterfaceOnlyComponentEventEmitter::onDirectChange(OnDirectChange $event) c
   });
 }
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -419,11 +397,9 @@ Map {
 #include <react/renderer/components/EXCLUDE_ANDROID/EventEmitters.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -443,11 +419,9 @@ Map {
 #include <react/renderer/components/EXCLUDE_ANDROID_IOS/EventEmitters.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -467,12 +441,10 @@ Map {
 #include <react/renderer/components/EXCLUDE_IOS_TWO_COMPONENTS_DIFFERENT_FILES/EventEmitters.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -492,11 +464,9 @@ Map {
 #include <react/renderer/components/FLOAT_PROPS/EventEmitters.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -516,11 +486,9 @@ Map {
 #include <react/renderer/components/IMAGE_PROP/EventEmitters.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -540,11 +508,9 @@ Map {
 #include <react/renderer/components/INSETS_PROP/EventEmitters.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -564,11 +530,9 @@ Map {
 #include <react/renderer/components/INT32_ENUM_PROP/EventEmitters.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -588,11 +552,9 @@ Map {
 #include <react/renderer/components/INTEGER_PROPS/EventEmitters.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -612,8 +574,7 @@ Map {
 #include <react/renderer/components/INTERFACE_ONLY/EventEmitters.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 void InterfaceOnlyComponentEventEmitter::onChange(OnChange $event) const {
   dispatchEvent(\\"change\\", [$event=std::move($event)](jsi::Runtime &runtime) {
@@ -623,8 +584,7 @@ void InterfaceOnlyComponentEventEmitter::onChange(OnChange $event) const {
   });
 }
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -644,11 +604,9 @@ Map {
 #include <react/renderer/components/MIXED_PROP/EventEmitters.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -668,11 +626,9 @@ Map {
 #include <react/renderer/components/MULTI_NATIVE_PROP/EventEmitters.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -692,11 +648,9 @@ Map {
 #include <react/renderer/components/NO_PROPS_NO_EVENTS/EventEmitters.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -716,11 +670,9 @@ Map {
 #include <react/renderer/components/OBJECT_PROPS/EventEmitters.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -740,11 +692,9 @@ Map {
 #include <react/renderer/components/POINT_PROP/EventEmitters.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -764,11 +714,9 @@ Map {
 #include <react/renderer/components/STRING_ENUM_PROP/EventEmitters.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -788,11 +736,9 @@ Map {
 #include <react/renderer/components/STRING_PROP/EventEmitters.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -812,12 +758,10 @@ Map {
 #include <react/renderer/components/TWO_COMPONENTS_DIFFERENT_FILES/EventEmitters.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -837,12 +781,10 @@ Map {
 #include <react/renderer/components/TWO_COMPONENTS_SAME_FILE/EventEmitters.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
diff --git a/packages/react-native-codegen/src/generators/components/__tests__/__snapshots__/GenerateEventEmitterH-test.js.snap b/packages/react-native-codegen/src/generators/components/__tests__/__snapshots__/GenerateEventEmitterH-test.js.snap
index ca4237ab4d7474..b6de40820ccb6d 100644
--- a/packages/react-native-codegen/src/generators/components/__tests__/__snapshots__/GenerateEventEmitterH-test.js.snap
+++ b/packages/react-native-codegen/src/generators/components/__tests__/__snapshots__/GenerateEventEmitterH-test.js.snap
@@ -16,8 +16,7 @@ Map {
 #include <react/renderer/components/view/ViewEventEmitter.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 class ArrayPropsNativeComponentEventEmitter : public ViewEventEmitter {
  public:
   using ViewEventEmitter::ViewEventEmitter;
@@ -25,8 +24,7 @@ class ArrayPropsNativeComponentEventEmitter : public ViewEventEmitter {
   
   
 };
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -47,8 +45,7 @@ Map {
 #include <react/renderer/components/view/ViewEventEmitter.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 class ArrayPropsNativeComponentEventEmitter : public ViewEventEmitter {
  public:
   using ViewEventEmitter::ViewEventEmitter;
@@ -56,8 +53,7 @@ class ArrayPropsNativeComponentEventEmitter : public ViewEventEmitter {
   
   
 };
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -78,8 +74,7 @@ Map {
 #include <react/renderer/components/view/ViewEventEmitter.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 class BooleanPropNativeComponentEventEmitter : public ViewEventEmitter {
  public:
   using ViewEventEmitter::ViewEventEmitter;
@@ -87,8 +82,7 @@ class BooleanPropNativeComponentEventEmitter : public ViewEventEmitter {
   
   
 };
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -109,8 +103,7 @@ Map {
 #include <react/renderer/components/view/ViewEventEmitter.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 class ColorPropNativeComponentEventEmitter : public ViewEventEmitter {
  public:
   using ViewEventEmitter::ViewEventEmitter;
@@ -118,8 +111,7 @@ class ColorPropNativeComponentEventEmitter : public ViewEventEmitter {
   
   
 };
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -140,8 +132,7 @@ Map {
 #include <react/renderer/components/view/ViewEventEmitter.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 class CommandNativeComponentEventEmitter : public ViewEventEmitter {
  public:
   using ViewEventEmitter::ViewEventEmitter;
@@ -149,8 +140,7 @@ class CommandNativeComponentEventEmitter : public ViewEventEmitter {
   
   
 };
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -171,8 +161,7 @@ Map {
 #include <react/renderer/components/view/ViewEventEmitter.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 class CommandNativeComponentEventEmitter : public ViewEventEmitter {
  public:
   using ViewEventEmitter::ViewEventEmitter;
@@ -180,8 +169,7 @@ class CommandNativeComponentEventEmitter : public ViewEventEmitter {
   
   
 };
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -202,8 +190,7 @@ Map {
 #include <react/renderer/components/view/ViewEventEmitter.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 class DimensionPropNativeComponentEventEmitter : public ViewEventEmitter {
  public:
   using ViewEventEmitter::ViewEventEmitter;
@@ -211,8 +198,7 @@ class DimensionPropNativeComponentEventEmitter : public ViewEventEmitter {
   
   
 };
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -233,8 +219,7 @@ Map {
 #include <react/renderer/components/view/ViewEventEmitter.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 class DoublePropNativeComponentEventEmitter : public ViewEventEmitter {
  public:
   using ViewEventEmitter::ViewEventEmitter;
@@ -242,8 +227,7 @@ class DoublePropNativeComponentEventEmitter : public ViewEventEmitter {
   
   
 };
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -264,8 +248,7 @@ Map {
 #include <react/renderer/components/view/ViewEventEmitter.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 class EventsNestedObjectNativeComponentEventEmitter : public ViewEventEmitter {
  public:
   using ViewEventEmitter::ViewEventEmitter;
@@ -285,8 +268,7 @@ class EventsNestedObjectNativeComponentEventEmitter : public ViewEventEmitter {
     };
   void onChange(OnChange value) const;
 };
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -307,8 +289,7 @@ Map {
 #include <react/renderer/components/view/ViewEventEmitter.h>
 #include <folly/dynamic.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 class EventsNativeComponentEventEmitter : public ViewEventEmitter {
  public:
   using ViewEventEmitter::ViewEventEmitter;
@@ -381,8 +362,7 @@ class EventsNativeComponentEventEmitter : public ViewEventEmitter {
 
   void onEventWithMixedPropAttribute(OnEventWithMixedPropAttribute value) const;
 };
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -403,8 +383,7 @@ Map {
 #include <react/renderer/components/view/ViewEventEmitter.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 class InterfaceOnlyComponentEventEmitter : public ViewEventEmitter {
  public:
   using ViewEventEmitter::ViewEventEmitter;
@@ -420,8 +399,7 @@ class InterfaceOnlyComponentEventEmitter : public ViewEventEmitter {
 
   void onDirectChange(OnDirectChange value) const;
 };
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -442,8 +420,7 @@ Map {
 #include <react/renderer/components/view/ViewEventEmitter.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 class ExcludedAndroidComponentEventEmitter : public ViewEventEmitter {
  public:
   using ViewEventEmitter::ViewEventEmitter;
@@ -451,8 +428,7 @@ class ExcludedAndroidComponentEventEmitter : public ViewEventEmitter {
   
   
 };
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -473,8 +449,7 @@ Map {
 #include <react/renderer/components/view/ViewEventEmitter.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 class ExcludedAndroidIosComponentEventEmitter : public ViewEventEmitter {
  public:
   using ViewEventEmitter::ViewEventEmitter;
@@ -482,8 +457,7 @@ class ExcludedAndroidIosComponentEventEmitter : public ViewEventEmitter {
   
   
 };
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -504,8 +478,7 @@ Map {
 #include <react/renderer/components/view/ViewEventEmitter.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 class ExcludedIosComponentEventEmitter : public ViewEventEmitter {
  public:
   using ViewEventEmitter::ViewEventEmitter;
@@ -520,8 +493,7 @@ class MultiFileIncludedNativeComponentEventEmitter : public ViewEventEmitter {
   
   
 };
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -542,8 +514,7 @@ Map {
 #include <react/renderer/components/view/ViewEventEmitter.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 class FloatPropNativeComponentEventEmitter : public ViewEventEmitter {
  public:
   using ViewEventEmitter::ViewEventEmitter;
@@ -551,8 +522,7 @@ class FloatPropNativeComponentEventEmitter : public ViewEventEmitter {
   
   
 };
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -573,8 +543,7 @@ Map {
 #include <react/renderer/components/view/ViewEventEmitter.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 class ImagePropNativeComponentEventEmitter : public ViewEventEmitter {
  public:
   using ViewEventEmitter::ViewEventEmitter;
@@ -582,8 +551,7 @@ class ImagePropNativeComponentEventEmitter : public ViewEventEmitter {
   
   
 };
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -604,8 +572,7 @@ Map {
 #include <react/renderer/components/view/ViewEventEmitter.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 class InsetsPropNativeComponentEventEmitter : public ViewEventEmitter {
  public:
   using ViewEventEmitter::ViewEventEmitter;
@@ -613,8 +580,7 @@ class InsetsPropNativeComponentEventEmitter : public ViewEventEmitter {
   
   
 };
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -635,8 +601,7 @@ Map {
 #include <react/renderer/components/view/ViewEventEmitter.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 class Int32EnumPropsNativeComponentEventEmitter : public ViewEventEmitter {
  public:
   using ViewEventEmitter::ViewEventEmitter;
@@ -644,8 +609,7 @@ class Int32EnumPropsNativeComponentEventEmitter : public ViewEventEmitter {
   
   
 };
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -666,8 +630,7 @@ Map {
 #include <react/renderer/components/view/ViewEventEmitter.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 class IntegerPropNativeComponentEventEmitter : public ViewEventEmitter {
  public:
   using ViewEventEmitter::ViewEventEmitter;
@@ -675,8 +638,7 @@ class IntegerPropNativeComponentEventEmitter : public ViewEventEmitter {
   
   
 };
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -697,8 +659,7 @@ Map {
 #include <react/renderer/components/view/ViewEventEmitter.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 class InterfaceOnlyComponentEventEmitter : public ViewEventEmitter {
  public:
   using ViewEventEmitter::ViewEventEmitter;
@@ -708,8 +669,7 @@ class InterfaceOnlyComponentEventEmitter : public ViewEventEmitter {
     };
   void onChange(OnChange value) const;
 };
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -730,8 +690,7 @@ Map {
 #include <react/renderer/components/view/ViewEventEmitter.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 class MixedPropNativeComponentEventEmitter : public ViewEventEmitter {
  public:
   using ViewEventEmitter::ViewEventEmitter;
@@ -739,8 +698,7 @@ class MixedPropNativeComponentEventEmitter : public ViewEventEmitter {
   
   
 };
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -761,8 +719,7 @@ Map {
 #include <react/renderer/components/view/ViewEventEmitter.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 class ImageColorPropNativeComponentEventEmitter : public ViewEventEmitter {
  public:
   using ViewEventEmitter::ViewEventEmitter;
@@ -770,8 +727,7 @@ class ImageColorPropNativeComponentEventEmitter : public ViewEventEmitter {
   
   
 };
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -792,8 +748,7 @@ Map {
 #include <react/renderer/components/view/ViewEventEmitter.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 class NoPropsNoEventsComponentEventEmitter : public ViewEventEmitter {
  public:
   using ViewEventEmitter::ViewEventEmitter;
@@ -801,8 +756,7 @@ class NoPropsNoEventsComponentEventEmitter : public ViewEventEmitter {
   
   
 };
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -823,8 +777,7 @@ Map {
 #include <react/renderer/components/view/ViewEventEmitter.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 class ObjectPropsEventEmitter : public ViewEventEmitter {
  public:
   using ViewEventEmitter::ViewEventEmitter;
@@ -832,8 +785,7 @@ class ObjectPropsEventEmitter : public ViewEventEmitter {
   
   
 };
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -854,8 +806,7 @@ Map {
 #include <react/renderer/components/view/ViewEventEmitter.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 class PointPropNativeComponentEventEmitter : public ViewEventEmitter {
  public:
   using ViewEventEmitter::ViewEventEmitter;
@@ -863,8 +814,7 @@ class PointPropNativeComponentEventEmitter : public ViewEventEmitter {
   
   
 };
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -885,8 +835,7 @@ Map {
 #include <react/renderer/components/view/ViewEventEmitter.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 class StringEnumPropsNativeComponentEventEmitter : public ViewEventEmitter {
  public:
   using ViewEventEmitter::ViewEventEmitter;
@@ -894,8 +843,7 @@ class StringEnumPropsNativeComponentEventEmitter : public ViewEventEmitter {
   
   
 };
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -916,8 +864,7 @@ Map {
 #include <react/renderer/components/view/ViewEventEmitter.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 class StringPropComponentEventEmitter : public ViewEventEmitter {
  public:
   using ViewEventEmitter::ViewEventEmitter;
@@ -925,8 +872,7 @@ class StringPropComponentEventEmitter : public ViewEventEmitter {
   
   
 };
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -947,8 +893,7 @@ Map {
 #include <react/renderer/components/view/ViewEventEmitter.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 class MultiFile1NativeComponentEventEmitter : public ViewEventEmitter {
  public:
   using ViewEventEmitter::ViewEventEmitter;
@@ -963,8 +908,7 @@ class MultiFile2NativeComponentEventEmitter : public ViewEventEmitter {
   
   
 };
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -985,8 +929,7 @@ Map {
 #include <react/renderer/components/view/ViewEventEmitter.h>
 
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 class MultiComponent1NativeComponentEventEmitter : public ViewEventEmitter {
  public:
   using ViewEventEmitter::ViewEventEmitter;
@@ -1001,8 +944,7 @@ class MultiComponent2NativeComponentEventEmitter : public ViewEventEmitter {
   
   
 };
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
diff --git a/packages/react-native-codegen/src/generators/components/__tests__/__snapshots__/GeneratePropsCpp-test.js.snap b/packages/react-native-codegen/src/generators/components/__tests__/__snapshots__/GeneratePropsCpp-test.js.snap
index 2dd8e73764b4c6..8d21560f105d53 100644
--- a/packages/react-native-codegen/src/generators/components/__tests__/__snapshots__/GeneratePropsCpp-test.js.snap
+++ b/packages/react-native-codegen/src/generators/components/__tests__/__snapshots__/GeneratePropsCpp-test.js.snap
@@ -18,8 +18,7 @@ Map {
 #include <react/renderer/core/PropsParserContext.h>
 #include <react/renderer/core/propsConversions.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 ArrayPropsNativeComponentProps::ArrayPropsNativeComponentProps(
     const PropsParserContext &context,
@@ -40,8 +39,7 @@ ArrayPropsNativeComponentProps::ArrayPropsNativeComponentProps(
     arrayOfArrayOfObject(convertRawProp(context, rawProps, \\"arrayOfArrayOfObject\\", sourceProps.arrayOfArrayOfObject, {}))
       {}
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -62,8 +60,7 @@ Map {
 #include <react/renderer/core/PropsParserContext.h>
 #include <react/renderer/core/propsConversions.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 ArrayPropsNativeComponentProps::ArrayPropsNativeComponentProps(
     const PropsParserContext &context,
@@ -73,8 +70,7 @@ ArrayPropsNativeComponentProps::ArrayPropsNativeComponentProps(
     nativePrimitives(convertRawProp(context, rawProps, \\"nativePrimitives\\", sourceProps.nativePrimitives, {}))
       {}
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -95,8 +91,7 @@ Map {
 #include <react/renderer/core/PropsParserContext.h>
 #include <react/renderer/core/propsConversions.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 BooleanPropNativeComponentProps::BooleanPropNativeComponentProps(
     const PropsParserContext &context,
@@ -106,8 +101,7 @@ BooleanPropNativeComponentProps::BooleanPropNativeComponentProps(
     disabled(convertRawProp(context, rawProps, \\"disabled\\", sourceProps.disabled, {false}))
       {}
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -128,8 +122,7 @@ Map {
 #include <react/renderer/core/PropsParserContext.h>
 #include <react/renderer/core/propsConversions.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 ColorPropNativeComponentProps::ColorPropNativeComponentProps(
     const PropsParserContext &context,
@@ -139,8 +132,7 @@ ColorPropNativeComponentProps::ColorPropNativeComponentProps(
     tintColor(convertRawProp(context, rawProps, \\"tintColor\\", sourceProps.tintColor, {}))
       {}
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -161,8 +153,7 @@ Map {
 #include <react/renderer/core/PropsParserContext.h>
 #include <react/renderer/core/propsConversions.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 CommandNativeComponentProps::CommandNativeComponentProps(
     const PropsParserContext &context,
@@ -172,8 +163,7 @@ CommandNativeComponentProps::CommandNativeComponentProps(
     
       {}
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -194,8 +184,7 @@ Map {
 #include <react/renderer/core/PropsParserContext.h>
 #include <react/renderer/core/propsConversions.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 CommandNativeComponentProps::CommandNativeComponentProps(
     const PropsParserContext &context,
@@ -205,8 +194,7 @@ CommandNativeComponentProps::CommandNativeComponentProps(
     accessibilityHint(convertRawProp(context, rawProps, \\"accessibilityHint\\", sourceProps.accessibilityHint, {\\"\\"}))
       {}
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -228,8 +216,7 @@ Map {
 #include <react/renderer/core/PropsParserContext.h>
 #include <react/renderer/core/propsConversions.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 DimensionPropNativeComponentProps::DimensionPropNativeComponentProps(
     const PropsParserContext &context,
@@ -239,8 +226,7 @@ DimensionPropNativeComponentProps::DimensionPropNativeComponentProps(
     marginBack(convertRawProp(context, rawProps, \\"marginBack\\", sourceProps.marginBack, {}))
       {}
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -261,8 +247,7 @@ Map {
 #include <react/renderer/core/PropsParserContext.h>
 #include <react/renderer/core/propsConversions.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 DoublePropNativeComponentProps::DoublePropNativeComponentProps(
     const PropsParserContext &context,
@@ -277,8 +262,7 @@ DoublePropNativeComponentProps::DoublePropNativeComponentProps(
     blurRadius6(convertRawProp(context, rawProps, \\"blurRadius6\\", sourceProps.blurRadius6, {0.0}))
       {}
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -299,8 +283,7 @@ Map {
 #include <react/renderer/core/PropsParserContext.h>
 #include <react/renderer/core/propsConversions.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 EventsNestedObjectNativeComponentProps::EventsNestedObjectNativeComponentProps(
     const PropsParserContext &context,
@@ -310,8 +293,7 @@ EventsNestedObjectNativeComponentProps::EventsNestedObjectNativeComponentProps(
     disabled(convertRawProp(context, rawProps, \\"disabled\\", sourceProps.disabled, {false}))
       {}
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -332,8 +314,7 @@ Map {
 #include <react/renderer/core/PropsParserContext.h>
 #include <react/renderer/core/propsConversions.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 EventsNativeComponentProps::EventsNativeComponentProps(
     const PropsParserContext &context,
@@ -343,8 +324,7 @@ EventsNativeComponentProps::EventsNativeComponentProps(
     disabled(convertRawProp(context, rawProps, \\"disabled\\", sourceProps.disabled, {false}))
       {}
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -365,8 +345,7 @@ Map {
 #include <react/renderer/core/PropsParserContext.h>
 #include <react/renderer/core/propsConversions.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 InterfaceOnlyComponentProps::InterfaceOnlyComponentProps(
     const PropsParserContext &context,
@@ -376,8 +355,7 @@ InterfaceOnlyComponentProps::InterfaceOnlyComponentProps(
     
       {}
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -398,8 +376,7 @@ Map {
 #include <react/renderer/core/PropsParserContext.h>
 #include <react/renderer/core/propsConversions.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 ExcludedAndroidComponentProps::ExcludedAndroidComponentProps(
     const PropsParserContext &context,
@@ -409,8 +386,7 @@ ExcludedAndroidComponentProps::ExcludedAndroidComponentProps(
     
       {}
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -431,8 +407,7 @@ Map {
 #include <react/renderer/core/PropsParserContext.h>
 #include <react/renderer/core/propsConversions.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 ExcludedAndroidIosComponentProps::ExcludedAndroidIosComponentProps(
     const PropsParserContext &context,
@@ -442,8 +417,7 @@ ExcludedAndroidIosComponentProps::ExcludedAndroidIosComponentProps(
     
       {}
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -464,8 +438,7 @@ Map {
 #include <react/renderer/core/PropsParserContext.h>
 #include <react/renderer/core/propsConversions.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 ExcludedIosComponentProps::ExcludedIosComponentProps(
     const PropsParserContext &context,
@@ -482,8 +455,7 @@ MultiFileIncludedNativeComponentProps::MultiFileIncludedNativeComponentProps(
     disabled(convertRawProp(context, rawProps, \\"disabled\\", sourceProps.disabled, {true}))
       {}
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -504,8 +476,7 @@ Map {
 #include <react/renderer/core/PropsParserContext.h>
 #include <react/renderer/core/propsConversions.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 FloatPropNativeComponentProps::FloatPropNativeComponentProps(
     const PropsParserContext &context,
@@ -520,8 +491,7 @@ FloatPropNativeComponentProps::FloatPropNativeComponentProps(
     blurRadius6(convertRawProp(context, rawProps, \\"blurRadius6\\", sourceProps.blurRadius6, {0.0}))
       {}
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -543,8 +513,7 @@ Map {
 #include <react/renderer/core/PropsParserContext.h>
 #include <react/renderer/core/propsConversions.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 ImagePropNativeComponentProps::ImagePropNativeComponentProps(
     const PropsParserContext &context,
@@ -554,8 +523,7 @@ ImagePropNativeComponentProps::ImagePropNativeComponentProps(
     thumbImage(convertRawProp(context, rawProps, \\"thumbImage\\", sourceProps.thumbImage, {}))
       {}
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -576,8 +544,7 @@ Map {
 #include <react/renderer/core/PropsParserContext.h>
 #include <react/renderer/core/propsConversions.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 InsetsPropNativeComponentProps::InsetsPropNativeComponentProps(
     const PropsParserContext &context,
@@ -587,8 +554,7 @@ InsetsPropNativeComponentProps::InsetsPropNativeComponentProps(
     contentInset(convertRawProp(context, rawProps, \\"contentInset\\", sourceProps.contentInset, {}))
       {}
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -609,8 +575,7 @@ Map {
 #include <react/renderer/core/PropsParserContext.h>
 #include <react/renderer/core/propsConversions.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 Int32EnumPropsNativeComponentProps::Int32EnumPropsNativeComponentProps(
     const PropsParserContext &context,
@@ -620,8 +585,7 @@ Int32EnumPropsNativeComponentProps::Int32EnumPropsNativeComponentProps(
     maxInterval(convertRawProp(context, rawProps, \\"maxInterval\\", sourceProps.maxInterval, {Int32EnumPropsNativeComponentMaxInterval::MaxInterval0}))
       {}
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -642,8 +606,7 @@ Map {
 #include <react/renderer/core/PropsParserContext.h>
 #include <react/renderer/core/propsConversions.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 IntegerPropNativeComponentProps::IntegerPropNativeComponentProps(
     const PropsParserContext &context,
@@ -655,8 +618,7 @@ IntegerPropNativeComponentProps::IntegerPropNativeComponentProps(
     progress3(convertRawProp(context, rawProps, \\"progress3\\", sourceProps.progress3, {10}))
       {}
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -677,8 +639,7 @@ Map {
 #include <react/renderer/core/PropsParserContext.h>
 #include <react/renderer/core/propsConversions.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 InterfaceOnlyComponentProps::InterfaceOnlyComponentProps(
     const PropsParserContext &context,
@@ -688,8 +649,7 @@ InterfaceOnlyComponentProps::InterfaceOnlyComponentProps(
     accessibilityHint(convertRawProp(context, rawProps, \\"accessibilityHint\\", sourceProps.accessibilityHint, {\\"\\"}))
       {}
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -711,8 +671,7 @@ Map {
 #include <react/renderer/core/PropsParserContext.h>
 #include <react/renderer/core/propsConversions.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 MixedPropNativeComponentProps::MixedPropNativeComponentProps(
     const PropsParserContext &context,
@@ -722,8 +681,7 @@ MixedPropNativeComponentProps::MixedPropNativeComponentProps(
     mixedProp(convertRawProp(context, rawProps, \\"mixedProp\\", sourceProps.mixedProp, {}))
       {}
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -745,8 +703,7 @@ Map {
 #include <react/renderer/core/PropsParserContext.h>
 #include <react/renderer/core/propsConversions.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 ImageColorPropNativeComponentProps::ImageColorPropNativeComponentProps(
     const PropsParserContext &context,
@@ -759,8 +716,7 @@ ImageColorPropNativeComponentProps::ImageColorPropNativeComponentProps(
     point(convertRawProp(context, rawProps, \\"point\\", sourceProps.point, {}))
       {}
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -781,8 +737,7 @@ Map {
 #include <react/renderer/core/PropsParserContext.h>
 #include <react/renderer/core/propsConversions.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 NoPropsNoEventsComponentProps::NoPropsNoEventsComponentProps(
     const PropsParserContext &context,
@@ -792,8 +747,7 @@ NoPropsNoEventsComponentProps::NoPropsNoEventsComponentProps(
     
       {}
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -815,8 +769,7 @@ Map {
 #include <react/renderer/core/PropsParserContext.h>
 #include <react/renderer/core/propsConversions.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 ObjectPropsProps::ObjectPropsProps(
     const PropsParserContext &context,
@@ -826,8 +779,7 @@ ObjectPropsProps::ObjectPropsProps(
     objectProp(convertRawProp(context, rawProps, \\"objectProp\\", sourceProps.objectProp, {}))
       {}
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -848,8 +800,7 @@ Map {
 #include <react/renderer/core/PropsParserContext.h>
 #include <react/renderer/core/propsConversions.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 PointPropNativeComponentProps::PointPropNativeComponentProps(
     const PropsParserContext &context,
@@ -859,8 +810,7 @@ PointPropNativeComponentProps::PointPropNativeComponentProps(
     startPoint(convertRawProp(context, rawProps, \\"startPoint\\", sourceProps.startPoint, {}))
       {}
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -881,8 +831,7 @@ Map {
 #include <react/renderer/core/PropsParserContext.h>
 #include <react/renderer/core/propsConversions.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 StringEnumPropsNativeComponentProps::StringEnumPropsNativeComponentProps(
     const PropsParserContext &context,
@@ -892,8 +841,7 @@ StringEnumPropsNativeComponentProps::StringEnumPropsNativeComponentProps(
     alignment(convertRawProp(context, rawProps, \\"alignment\\", sourceProps.alignment, {StringEnumPropsNativeComponentAlignment::Center}))
       {}
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -914,8 +862,7 @@ Map {
 #include <react/renderer/core/PropsParserContext.h>
 #include <react/renderer/core/propsConversions.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 StringPropComponentProps::StringPropComponentProps(
     const PropsParserContext &context,
@@ -926,8 +873,7 @@ StringPropComponentProps::StringPropComponentProps(
     accessibilityRole(convertRawProp(context, rawProps, \\"accessibilityRole\\", sourceProps.accessibilityRole, {}))
       {}
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -948,8 +894,7 @@ Map {
 #include <react/renderer/core/PropsParserContext.h>
 #include <react/renderer/core/propsConversions.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 MultiFile1NativeComponentProps::MultiFile1NativeComponentProps(
     const PropsParserContext &context,
@@ -966,8 +911,7 @@ MultiFile2NativeComponentProps::MultiFile2NativeComponentProps(
     disabled(convertRawProp(context, rawProps, \\"disabled\\", sourceProps.disabled, {true}))
       {}
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -988,8 +932,7 @@ Map {
 #include <react/renderer/core/PropsParserContext.h>
 #include <react/renderer/core/propsConversions.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 MultiComponent1NativeComponentProps::MultiComponent1NativeComponentProps(
     const PropsParserContext &context,
@@ -1006,8 +949,7 @@ MultiComponent2NativeComponentProps::MultiComponent2NativeComponentProps(
     disabled(convertRawProp(context, rawProps, \\"disabled\\", sourceProps.disabled, {true}))
       {}
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
diff --git a/packages/react-native-codegen/src/generators/components/__tests__/__snapshots__/GeneratePropsH-test.js.snap b/packages/react-native-codegen/src/generators/components/__tests__/__snapshots__/GeneratePropsH-test.js.snap
index d22ef6b85965ab..de244b9f33b380 100644
--- a/packages/react-native-codegen/src/generators/components/__tests__/__snapshots__/GeneratePropsH-test.js.snap
+++ b/packages/react-native-codegen/src/generators/components/__tests__/__snapshots__/GeneratePropsH-test.js.snap
@@ -23,8 +23,7 @@ Map {
 #include <vector>
 #include <yoga/Yoga.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 using ArrayPropsNativeComponentSizesMask = uint32_t;
 
@@ -213,8 +212,7 @@ class ArrayPropsNativeComponentProps final : public ViewProps {
   std::vector<std::vector<ArrayPropsNativeComponentArrayOfArrayOfObjectStruct>> arrayOfArrayOfObject{};
 };
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -241,8 +239,7 @@ Map {
 #include <react/renderer/imagemanager/primitives.h>
 #include <vector>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 struct ArrayPropsNativeComponentNativePrimitivesStruct {
   std::vector<SharedColor> colors;
@@ -290,8 +287,7 @@ class ArrayPropsNativeComponentProps final : public ViewProps {
   std::vector<ArrayPropsNativeComponentNativePrimitivesStruct> nativePrimitives{};
 };
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -312,8 +308,7 @@ Map {
 #include <react/renderer/components/view/ViewProps.h>
 #include <react/renderer/core/PropsParserContext.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 class BooleanPropNativeComponentProps final : public ViewProps {
  public:
@@ -325,8 +320,7 @@ class BooleanPropNativeComponentProps final : public ViewProps {
   bool disabled{false};
 };
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -348,8 +342,7 @@ Map {
 #include <react/renderer/core/PropsParserContext.h>
 #include <react/renderer/graphics/Color.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 class ColorPropNativeComponentProps final : public ViewProps {
  public:
@@ -361,8 +354,7 @@ class ColorPropNativeComponentProps final : public ViewProps {
   SharedColor tintColor{};
 };
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -383,8 +375,7 @@ Map {
 #include <react/renderer/components/view/ViewProps.h>
 #include <react/renderer/core/PropsParserContext.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 class CommandNativeComponentProps final : public ViewProps {
  public:
@@ -396,8 +387,7 @@ class CommandNativeComponentProps final : public ViewProps {
   
 };
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -418,8 +408,7 @@ Map {
 #include <react/renderer/components/view/ViewProps.h>
 #include <react/renderer/core/PropsParserContext.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 class CommandNativeComponentProps final : public ViewProps {
  public:
@@ -431,8 +420,7 @@ class CommandNativeComponentProps final : public ViewProps {
   std::string accessibilityHint{\\"\\"};
 };
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -454,8 +442,7 @@ Map {
 #include <react/renderer/core/PropsParserContext.h>
 #include <yoga/Yoga.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 class DimensionPropNativeComponentProps final : public ViewProps {
  public:
@@ -467,8 +454,7 @@ class DimensionPropNativeComponentProps final : public ViewProps {
   YGValue marginBack{};
 };
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -489,8 +475,7 @@ Map {
 #include <react/renderer/components/view/ViewProps.h>
 #include <react/renderer/core/PropsParserContext.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 class DoublePropNativeComponentProps final : public ViewProps {
  public:
@@ -507,8 +492,7 @@ class DoublePropNativeComponentProps final : public ViewProps {
   double blurRadius6{0.0};
 };
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -529,8 +513,7 @@ Map {
 #include <react/renderer/components/view/ViewProps.h>
 #include <react/renderer/core/PropsParserContext.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 class EventsNestedObjectNativeComponentProps final : public ViewProps {
  public:
@@ -542,8 +525,7 @@ class EventsNestedObjectNativeComponentProps final : public ViewProps {
   bool disabled{false};
 };
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -564,8 +546,7 @@ Map {
 #include <react/renderer/components/view/ViewProps.h>
 #include <react/renderer/core/PropsParserContext.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 class EventsNativeComponentProps final : public ViewProps {
  public:
@@ -577,8 +558,7 @@ class EventsNativeComponentProps final : public ViewProps {
   bool disabled{false};
 };
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -599,8 +579,7 @@ Map {
 #include <react/renderer/components/view/ViewProps.h>
 #include <react/renderer/core/PropsParserContext.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 class InterfaceOnlyComponentProps final : public ViewProps {
  public:
@@ -612,8 +591,7 @@ class InterfaceOnlyComponentProps final : public ViewProps {
   
 };
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -634,8 +612,7 @@ Map {
 #include <react/renderer/components/view/ViewProps.h>
 #include <react/renderer/core/PropsParserContext.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 class ExcludedAndroidComponentProps final : public ViewProps {
  public:
@@ -647,8 +624,7 @@ class ExcludedAndroidComponentProps final : public ViewProps {
   
 };
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -669,8 +645,7 @@ Map {
 #include <react/renderer/components/view/ViewProps.h>
 #include <react/renderer/core/PropsParserContext.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 class ExcludedAndroidIosComponentProps final : public ViewProps {
  public:
@@ -682,8 +657,7 @@ class ExcludedAndroidIosComponentProps final : public ViewProps {
   
 };
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -704,8 +678,7 @@ Map {
 #include <react/renderer/components/view/ViewProps.h>
 #include <react/renderer/core/PropsParserContext.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 class ExcludedIosComponentProps final : public ViewProps {
  public:
@@ -727,8 +700,7 @@ class MultiFileIncludedNativeComponentProps final : public ViewProps {
   bool disabled{true};
 };
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -749,8 +721,7 @@ Map {
 #include <react/renderer/components/view/ViewProps.h>
 #include <react/renderer/core/PropsParserContext.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 class FloatPropNativeComponentProps final : public ViewProps {
  public:
@@ -767,8 +738,7 @@ class FloatPropNativeComponentProps final : public ViewProps {
   Float blurRadius6{0.0};
 };
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -790,8 +760,7 @@ Map {
 #include <react/renderer/core/PropsParserContext.h>
 #include <react/renderer/imagemanager/primitives.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 class ImagePropNativeComponentProps final : public ViewProps {
  public:
@@ -803,8 +772,7 @@ class ImagePropNativeComponentProps final : public ViewProps {
   ImageSource thumbImage{};
 };
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -826,8 +794,7 @@ Map {
 #include <react/renderer/core/PropsParserContext.h>
 #include <react/renderer/graphics/RectangleEdges.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 class InsetsPropNativeComponentProps final : public ViewProps {
  public:
@@ -839,8 +806,7 @@ class InsetsPropNativeComponentProps final : public ViewProps {
   EdgeInsets contentInset{};
 };
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -861,8 +827,7 @@ Map {
 #include <react/renderer/components/view/ViewProps.h>
 #include <react/renderer/core/PropsParserContext.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 enum class Int32EnumPropsNativeComponentMaxInterval { MaxInterval0 = 0, MaxInterval1 = 1, MaxInterval2 = 2 };
 
@@ -901,8 +866,7 @@ class Int32EnumPropsNativeComponentProps final : public ViewProps {
   Int32EnumPropsNativeComponentMaxInterval maxInterval{Int32EnumPropsNativeComponentMaxInterval::MaxInterval0};
 };
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -923,8 +887,7 @@ Map {
 #include <react/renderer/components/view/ViewProps.h>
 #include <react/renderer/core/PropsParserContext.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 class IntegerPropNativeComponentProps final : public ViewProps {
  public:
@@ -938,8 +901,7 @@ class IntegerPropNativeComponentProps final : public ViewProps {
   int progress3{10};
 };
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -960,8 +922,7 @@ Map {
 #include <react/renderer/components/view/ViewProps.h>
 #include <react/renderer/core/PropsParserContext.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 class InterfaceOnlyComponentProps final : public ViewProps {
  public:
@@ -973,8 +934,7 @@ class InterfaceOnlyComponentProps final : public ViewProps {
   std::string accessibilityHint{\\"\\"};
 };
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -995,8 +955,7 @@ Map {
 #include <react/renderer/components/view/ViewProps.h>
 #include <react/renderer/core/PropsParserContext.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 class MixedPropNativeComponentProps final : public ViewProps {
  public:
@@ -1008,8 +967,7 @@ class MixedPropNativeComponentProps final : public ViewProps {
   folly::dynamic mixedProp{};
 };
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -1033,8 +991,7 @@ Map {
 #include <react/renderer/graphics/Point.h>
 #include <react/renderer/imagemanager/primitives.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 class ImageColorPropNativeComponentProps final : public ViewProps {
  public:
@@ -1049,8 +1006,7 @@ class ImageColorPropNativeComponentProps final : public ViewProps {
   Point point{};
 };
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -1071,8 +1027,7 @@ Map {
 #include <react/renderer/components/view/ViewProps.h>
 #include <react/renderer/core/PropsParserContext.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 class NoPropsNoEventsComponentProps final : public ViewProps {
  public:
@@ -1084,8 +1039,7 @@ class NoPropsNoEventsComponentProps final : public ViewProps {
   
 };
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -1112,8 +1066,7 @@ Map {
 #include <react/renderer/imagemanager/primitives.h>
 #include <vector>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 enum class ObjectPropsStringEnumProp { Option1 };
 
@@ -1339,8 +1292,7 @@ class ObjectPropsProps final : public ViewProps {
   ObjectPropsObjectPropStruct objectProp{};
 };
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -1362,8 +1314,7 @@ Map {
 #include <react/renderer/core/PropsParserContext.h>
 #include <react/renderer/graphics/Point.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 class PointPropNativeComponentProps final : public ViewProps {
  public:
@@ -1375,8 +1326,7 @@ class PointPropNativeComponentProps final : public ViewProps {
   Point startPoint{};
 };
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -1397,8 +1347,7 @@ Map {
 #include <react/renderer/components/view/ViewProps.h>
 #include <react/renderer/core/PropsParserContext.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 enum class StringEnumPropsNativeComponentAlignment { Top, Center, BottomRight };
 
@@ -1428,8 +1377,7 @@ class StringEnumPropsNativeComponentProps final : public ViewProps {
   StringEnumPropsNativeComponentAlignment alignment{StringEnumPropsNativeComponentAlignment::Center};
 };
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -1450,8 +1398,7 @@ Map {
 #include <react/renderer/components/view/ViewProps.h>
 #include <react/renderer/core/PropsParserContext.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 class StringPropComponentProps final : public ViewProps {
  public:
@@ -1464,8 +1411,7 @@ class StringPropComponentProps final : public ViewProps {
   std::string accessibilityRole{};
 };
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -1486,8 +1432,7 @@ Map {
 #include <react/renderer/components/view/ViewProps.h>
 #include <react/renderer/core/PropsParserContext.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 class MultiFile1NativeComponentProps final : public ViewProps {
  public:
@@ -1509,8 +1454,7 @@ class MultiFile2NativeComponentProps final : public ViewProps {
   bool disabled{true};
 };
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -1531,8 +1475,7 @@ Map {
 #include <react/renderer/components/view/ViewProps.h>
 #include <react/renderer/core/PropsParserContext.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 class MultiComponent1NativeComponentProps final : public ViewProps {
  public:
@@ -1554,8 +1497,7 @@ class MultiComponent2NativeComponentProps final : public ViewProps {
   bool disabled{true};
 };
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
diff --git a/packages/react-native-codegen/src/generators/components/__tests__/__snapshots__/GenerateShadowNodeCpp-test.js.snap b/packages/react-native-codegen/src/generators/components/__tests__/__snapshots__/GenerateShadowNodeCpp-test.js.snap
index 6172d9ae625739..fb6c6404a1ee45 100644
--- a/packages/react-native-codegen/src/generators/components/__tests__/__snapshots__/GenerateShadowNodeCpp-test.js.snap
+++ b/packages/react-native-codegen/src/generators/components/__tests__/__snapshots__/GenerateShadowNodeCpp-test.js.snap
@@ -14,13 +14,11 @@ Map {
 
 #include <react/renderer/components/ARRAY_PROPS/ShadowNodes.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 extern const char ArrayPropsNativeComponentComponentName[] = \\"ArrayPropsNativeComponent\\";
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -39,13 +37,11 @@ Map {
 
 #include <react/renderer/components/ARRAY_PROPS_WITH_NESTED_OBJECT/ShadowNodes.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 extern const char ArrayPropsNativeComponentComponentName[] = \\"ArrayPropsNativeComponent\\";
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -64,13 +60,11 @@ Map {
 
 #include <react/renderer/components/BOOLEAN_PROP/ShadowNodes.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 extern const char BooleanPropNativeComponentComponentName[] = \\"BooleanPropNativeComponent\\";
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -89,13 +83,11 @@ Map {
 
 #include <react/renderer/components/COLOR_PROP/ShadowNodes.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 extern const char ColorPropNativeComponentComponentName[] = \\"ColorPropNativeComponent\\";
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -114,13 +106,11 @@ Map {
 
 #include <react/renderer/components/COMMANDS/ShadowNodes.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 extern const char CommandNativeComponentComponentName[] = \\"CommandNativeComponent\\";
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -139,13 +129,11 @@ Map {
 
 #include <react/renderer/components/COMMANDS_AND_PROPS/ShadowNodes.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 extern const char CommandNativeComponentComponentName[] = \\"CommandNativeComponent\\";
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -164,13 +152,11 @@ Map {
 
 #include <react/renderer/components/DIMENSION_PROP/ShadowNodes.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 extern const char DimensionPropNativeComponentComponentName[] = \\"DimensionPropNativeComponent\\";
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -189,13 +175,11 @@ Map {
 
 #include <react/renderer/components/DOUBLE_PROPS/ShadowNodes.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 extern const char DoublePropNativeComponentComponentName[] = \\"DoublePropNativeComponent\\";
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -214,13 +198,11 @@ Map {
 
 #include <react/renderer/components/EVENT_NESTED_OBJECT_PROPS/ShadowNodes.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 extern const char EventsNestedObjectNativeComponentComponentName[] = \\"EventsNestedObjectNativeComponent\\";
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -239,13 +221,11 @@ Map {
 
 #include <react/renderer/components/EVENT_PROPS/ShadowNodes.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 extern const char EventsNativeComponentComponentName[] = \\"EventsNativeComponent\\";
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -264,13 +244,11 @@ Map {
 
 #include <react/renderer/components/EVENTS_WITH_PAPER_NAME/ShadowNodes.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -289,13 +267,11 @@ Map {
 
 #include <react/renderer/components/EXCLUDE_ANDROID/ShadowNodes.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 extern const char ExcludedAndroidComponentComponentName[] = \\"ExcludedAndroidComponent\\";
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -314,13 +290,11 @@ Map {
 
 #include <react/renderer/components/EXCLUDE_ANDROID_IOS/ShadowNodes.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 extern const char ExcludedAndroidIosComponentComponentName[] = \\"ExcludedAndroidIosComponent\\";
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -339,14 +313,12 @@ Map {
 
 #include <react/renderer/components/EXCLUDE_IOS_TWO_COMPONENTS_DIFFERENT_FILES/ShadowNodes.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 extern const char ExcludedIosComponentComponentName[] = \\"ExcludedIosComponent\\";
 extern const char MultiFileIncludedNativeComponentComponentName[] = \\"MultiFileIncludedNativeComponent\\";
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -365,13 +337,11 @@ Map {
 
 #include <react/renderer/components/FLOAT_PROPS/ShadowNodes.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 extern const char FloatPropNativeComponentComponentName[] = \\"FloatPropNativeComponent\\";
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -390,13 +360,11 @@ Map {
 
 #include <react/renderer/components/IMAGE_PROP/ShadowNodes.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 extern const char ImagePropNativeComponentComponentName[] = \\"ImagePropNativeComponent\\";
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -415,13 +383,11 @@ Map {
 
 #include <react/renderer/components/INSETS_PROP/ShadowNodes.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 extern const char InsetsPropNativeComponentComponentName[] = \\"InsetsPropNativeComponent\\";
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -440,13 +406,11 @@ Map {
 
 #include <react/renderer/components/INT32_ENUM_PROP/ShadowNodes.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 extern const char Int32EnumPropsNativeComponentComponentName[] = \\"Int32EnumPropsNativeComponent\\";
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -465,13 +429,11 @@ Map {
 
 #include <react/renderer/components/INTEGER_PROPS/ShadowNodes.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 extern const char IntegerPropNativeComponentComponentName[] = \\"IntegerPropNativeComponent\\";
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -490,13 +452,11 @@ Map {
 
 #include <react/renderer/components/INTERFACE_ONLY/ShadowNodes.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -515,13 +475,11 @@ Map {
 
 #include <react/renderer/components/MIXED_PROP/ShadowNodes.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 extern const char MixedPropNativeComponentComponentName[] = \\"MixedPropNativeComponent\\";
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -540,13 +498,11 @@ Map {
 
 #include <react/renderer/components/MULTI_NATIVE_PROP/ShadowNodes.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 extern const char ImageColorPropNativeComponentComponentName[] = \\"ImageColorPropNativeComponent\\";
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -565,13 +521,11 @@ Map {
 
 #include <react/renderer/components/NO_PROPS_NO_EVENTS/ShadowNodes.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 extern const char NoPropsNoEventsComponentComponentName[] = \\"NoPropsNoEventsComponent\\";
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -590,13 +544,11 @@ Map {
 
 #include <react/renderer/components/OBJECT_PROPS/ShadowNodes.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 extern const char ObjectPropsComponentName[] = \\"ObjectProps\\";
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -615,13 +567,11 @@ Map {
 
 #include <react/renderer/components/POINT_PROP/ShadowNodes.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 extern const char PointPropNativeComponentComponentName[] = \\"PointPropNativeComponent\\";
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -640,13 +590,11 @@ Map {
 
 #include <react/renderer/components/STRING_ENUM_PROP/ShadowNodes.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 extern const char StringEnumPropsNativeComponentComponentName[] = \\"StringEnumPropsNativeComponent\\";
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -665,13 +613,11 @@ Map {
 
 #include <react/renderer/components/STRING_PROP/ShadowNodes.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 extern const char StringPropComponentComponentName[] = \\"StringPropComponent\\";
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -690,14 +636,12 @@ Map {
 
 #include <react/renderer/components/TWO_COMPONENTS_DIFFERENT_FILES/ShadowNodes.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 extern const char MultiFile1NativeComponentComponentName[] = \\"MultiFile1NativeComponent\\";
 extern const char MultiFile2NativeComponentComponentName[] = \\"MultiFile2NativeComponent\\";
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -716,14 +660,12 @@ Map {
 
 #include <react/renderer/components/TWO_COMPONENTS_SAME_FILE/ShadowNodes.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 extern const char MultiComponent1NativeComponentComponentName[] = \\"MultiComponent1NativeComponent\\";
 extern const char MultiComponent2NativeComponentComponentName[] = \\"MultiComponent2NativeComponent\\";
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
diff --git a/packages/react-native-codegen/src/generators/components/__tests__/__snapshots__/GenerateShadowNodeH-test.js.snap b/packages/react-native-codegen/src/generators/components/__tests__/__snapshots__/GenerateShadowNodeH-test.js.snap
index f8e76bfa9e41d2..00c65ca1865cbc 100644
--- a/packages/react-native-codegen/src/generators/components/__tests__/__snapshots__/GenerateShadowNodeH-test.js.snap
+++ b/packages/react-native-codegen/src/generators/components/__tests__/__snapshots__/GenerateShadowNodeH-test.js.snap
@@ -20,8 +20,7 @@ Map {
 #include <react/renderer/components/view/ConcreteViewShadowNode.h>
 #include <jsi/jsi.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 JSI_EXPORT extern const char ArrayPropsNativeComponentComponentName[];
 
@@ -34,8 +33,7 @@ using ArrayPropsNativeComponentShadowNode = ConcreteViewShadowNode<
     ArrayPropsNativeComponentEventEmitter,
     ArrayPropsNativeComponentState>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -60,8 +58,7 @@ Map {
 #include <react/renderer/components/view/ConcreteViewShadowNode.h>
 #include <jsi/jsi.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 JSI_EXPORT extern const char ArrayPropsNativeComponentComponentName[];
 
@@ -74,8 +71,7 @@ using ArrayPropsNativeComponentShadowNode = ConcreteViewShadowNode<
     ArrayPropsNativeComponentEventEmitter,
     ArrayPropsNativeComponentState>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -100,8 +96,7 @@ Map {
 #include <react/renderer/components/view/ConcreteViewShadowNode.h>
 #include <jsi/jsi.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 JSI_EXPORT extern const char BooleanPropNativeComponentComponentName[];
 
@@ -114,8 +109,7 @@ using BooleanPropNativeComponentShadowNode = ConcreteViewShadowNode<
     BooleanPropNativeComponentEventEmitter,
     BooleanPropNativeComponentState>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -140,8 +134,7 @@ Map {
 #include <react/renderer/components/view/ConcreteViewShadowNode.h>
 #include <jsi/jsi.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 JSI_EXPORT extern const char ColorPropNativeComponentComponentName[];
 
@@ -154,8 +147,7 @@ using ColorPropNativeComponentShadowNode = ConcreteViewShadowNode<
     ColorPropNativeComponentEventEmitter,
     ColorPropNativeComponentState>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -180,8 +172,7 @@ Map {
 #include <react/renderer/components/view/ConcreteViewShadowNode.h>
 #include <jsi/jsi.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 JSI_EXPORT extern const char CommandNativeComponentComponentName[];
 
@@ -194,8 +185,7 @@ using CommandNativeComponentShadowNode = ConcreteViewShadowNode<
     CommandNativeComponentEventEmitter,
     CommandNativeComponentState>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -220,8 +210,7 @@ Map {
 #include <react/renderer/components/view/ConcreteViewShadowNode.h>
 #include <jsi/jsi.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 JSI_EXPORT extern const char CommandNativeComponentComponentName[];
 
@@ -234,8 +223,7 @@ using CommandNativeComponentShadowNode = ConcreteViewShadowNode<
     CommandNativeComponentEventEmitter,
     CommandNativeComponentState>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -260,8 +248,7 @@ Map {
 #include <react/renderer/components/view/ConcreteViewShadowNode.h>
 #include <jsi/jsi.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 JSI_EXPORT extern const char DimensionPropNativeComponentComponentName[];
 
@@ -274,8 +261,7 @@ using DimensionPropNativeComponentShadowNode = ConcreteViewShadowNode<
     DimensionPropNativeComponentEventEmitter,
     DimensionPropNativeComponentState>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -300,8 +286,7 @@ Map {
 #include <react/renderer/components/view/ConcreteViewShadowNode.h>
 #include <jsi/jsi.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 JSI_EXPORT extern const char DoublePropNativeComponentComponentName[];
 
@@ -314,8 +299,7 @@ using DoublePropNativeComponentShadowNode = ConcreteViewShadowNode<
     DoublePropNativeComponentEventEmitter,
     DoublePropNativeComponentState>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -340,8 +324,7 @@ Map {
 #include <react/renderer/components/view/ConcreteViewShadowNode.h>
 #include <jsi/jsi.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 JSI_EXPORT extern const char EventsNestedObjectNativeComponentComponentName[];
 
@@ -354,8 +337,7 @@ using EventsNestedObjectNativeComponentShadowNode = ConcreteViewShadowNode<
     EventsNestedObjectNativeComponentEventEmitter,
     EventsNestedObjectNativeComponentState>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -380,8 +362,7 @@ Map {
 #include <react/renderer/components/view/ConcreteViewShadowNode.h>
 #include <jsi/jsi.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 JSI_EXPORT extern const char EventsNativeComponentComponentName[];
 
@@ -394,8 +375,7 @@ using EventsNativeComponentShadowNode = ConcreteViewShadowNode<
     EventsNativeComponentEventEmitter,
     EventsNativeComponentState>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -420,13 +400,11 @@ Map {
 #include <react/renderer/components/view/ConcreteViewShadowNode.h>
 #include <jsi/jsi.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -451,8 +429,7 @@ Map {
 #include <react/renderer/components/view/ConcreteViewShadowNode.h>
 #include <jsi/jsi.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 JSI_EXPORT extern const char ExcludedAndroidComponentComponentName[];
 
@@ -465,8 +442,7 @@ using ExcludedAndroidComponentShadowNode = ConcreteViewShadowNode<
     ExcludedAndroidComponentEventEmitter,
     ExcludedAndroidComponentState>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -491,8 +467,7 @@ Map {
 #include <react/renderer/components/view/ConcreteViewShadowNode.h>
 #include <jsi/jsi.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 JSI_EXPORT extern const char ExcludedAndroidIosComponentComponentName[];
 
@@ -505,8 +480,7 @@ using ExcludedAndroidIosComponentShadowNode = ConcreteViewShadowNode<
     ExcludedAndroidIosComponentEventEmitter,
     ExcludedAndroidIosComponentState>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -531,8 +505,7 @@ Map {
 #include <react/renderer/components/view/ConcreteViewShadowNode.h>
 #include <jsi/jsi.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 JSI_EXPORT extern const char ExcludedIosComponentComponentName[];
 
@@ -556,8 +529,7 @@ using MultiFileIncludedNativeComponentShadowNode = ConcreteViewShadowNode<
     MultiFileIncludedNativeComponentEventEmitter,
     MultiFileIncludedNativeComponentState>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -582,8 +554,7 @@ Map {
 #include <react/renderer/components/view/ConcreteViewShadowNode.h>
 #include <jsi/jsi.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 JSI_EXPORT extern const char FloatPropNativeComponentComponentName[];
 
@@ -596,8 +567,7 @@ using FloatPropNativeComponentShadowNode = ConcreteViewShadowNode<
     FloatPropNativeComponentEventEmitter,
     FloatPropNativeComponentState>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -622,8 +592,7 @@ Map {
 #include <react/renderer/components/view/ConcreteViewShadowNode.h>
 #include <jsi/jsi.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 JSI_EXPORT extern const char ImagePropNativeComponentComponentName[];
 
@@ -636,8 +605,7 @@ using ImagePropNativeComponentShadowNode = ConcreteViewShadowNode<
     ImagePropNativeComponentEventEmitter,
     ImagePropNativeComponentState>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -662,8 +630,7 @@ Map {
 #include <react/renderer/components/view/ConcreteViewShadowNode.h>
 #include <jsi/jsi.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 JSI_EXPORT extern const char InsetsPropNativeComponentComponentName[];
 
@@ -676,8 +643,7 @@ using InsetsPropNativeComponentShadowNode = ConcreteViewShadowNode<
     InsetsPropNativeComponentEventEmitter,
     InsetsPropNativeComponentState>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -702,8 +668,7 @@ Map {
 #include <react/renderer/components/view/ConcreteViewShadowNode.h>
 #include <jsi/jsi.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 JSI_EXPORT extern const char Int32EnumPropsNativeComponentComponentName[];
 
@@ -716,8 +681,7 @@ using Int32EnumPropsNativeComponentShadowNode = ConcreteViewShadowNode<
     Int32EnumPropsNativeComponentEventEmitter,
     Int32EnumPropsNativeComponentState>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -742,8 +706,7 @@ Map {
 #include <react/renderer/components/view/ConcreteViewShadowNode.h>
 #include <jsi/jsi.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 JSI_EXPORT extern const char IntegerPropNativeComponentComponentName[];
 
@@ -756,8 +719,7 @@ using IntegerPropNativeComponentShadowNode = ConcreteViewShadowNode<
     IntegerPropNativeComponentEventEmitter,
     IntegerPropNativeComponentState>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -782,13 +744,11 @@ Map {
 #include <react/renderer/components/view/ConcreteViewShadowNode.h>
 #include <jsi/jsi.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -813,8 +773,7 @@ Map {
 #include <react/renderer/components/view/ConcreteViewShadowNode.h>
 #include <jsi/jsi.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 JSI_EXPORT extern const char MixedPropNativeComponentComponentName[];
 
@@ -827,8 +786,7 @@ using MixedPropNativeComponentShadowNode = ConcreteViewShadowNode<
     MixedPropNativeComponentEventEmitter,
     MixedPropNativeComponentState>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -853,8 +811,7 @@ Map {
 #include <react/renderer/components/view/ConcreteViewShadowNode.h>
 #include <jsi/jsi.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 JSI_EXPORT extern const char ImageColorPropNativeComponentComponentName[];
 
@@ -867,8 +824,7 @@ using ImageColorPropNativeComponentShadowNode = ConcreteViewShadowNode<
     ImageColorPropNativeComponentEventEmitter,
     ImageColorPropNativeComponentState>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -893,8 +849,7 @@ Map {
 #include <react/renderer/components/view/ConcreteViewShadowNode.h>
 #include <jsi/jsi.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 JSI_EXPORT extern const char NoPropsNoEventsComponentComponentName[];
 
@@ -907,8 +862,7 @@ using NoPropsNoEventsComponentShadowNode = ConcreteViewShadowNode<
     NoPropsNoEventsComponentEventEmitter,
     NoPropsNoEventsComponentState>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -933,8 +887,7 @@ Map {
 #include <react/renderer/components/view/ConcreteViewShadowNode.h>
 #include <jsi/jsi.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 JSI_EXPORT extern const char ObjectPropsComponentName[];
 
@@ -947,8 +900,7 @@ using ObjectPropsShadowNode = ConcreteViewShadowNode<
     ObjectPropsEventEmitter,
     ObjectPropsState>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -973,8 +925,7 @@ Map {
 #include <react/renderer/components/view/ConcreteViewShadowNode.h>
 #include <jsi/jsi.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 JSI_EXPORT extern const char PointPropNativeComponentComponentName[];
 
@@ -987,8 +938,7 @@ using PointPropNativeComponentShadowNode = ConcreteViewShadowNode<
     PointPropNativeComponentEventEmitter,
     PointPropNativeComponentState>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -1013,8 +963,7 @@ Map {
 #include <react/renderer/components/view/ConcreteViewShadowNode.h>
 #include <jsi/jsi.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 JSI_EXPORT extern const char StringEnumPropsNativeComponentComponentName[];
 
@@ -1027,8 +976,7 @@ using StringEnumPropsNativeComponentShadowNode = ConcreteViewShadowNode<
     StringEnumPropsNativeComponentEventEmitter,
     StringEnumPropsNativeComponentState>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -1053,8 +1001,7 @@ Map {
 #include <react/renderer/components/view/ConcreteViewShadowNode.h>
 #include <jsi/jsi.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 JSI_EXPORT extern const char StringPropComponentComponentName[];
 
@@ -1067,8 +1014,7 @@ using StringPropComponentShadowNode = ConcreteViewShadowNode<
     StringPropComponentEventEmitter,
     StringPropComponentState>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -1093,8 +1039,7 @@ Map {
 #include <react/renderer/components/view/ConcreteViewShadowNode.h>
 #include <jsi/jsi.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 JSI_EXPORT extern const char MultiFile1NativeComponentComponentName[];
 
@@ -1118,8 +1063,7 @@ using MultiFile2NativeComponentShadowNode = ConcreteViewShadowNode<
     MultiFile2NativeComponentEventEmitter,
     MultiFile2NativeComponentState>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -1144,8 +1088,7 @@ Map {
 #include <react/renderer/components/view/ConcreteViewShadowNode.h>
 #include <jsi/jsi.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 JSI_EXPORT extern const char MultiComponent1NativeComponentComponentName[];
 
@@ -1169,8 +1112,7 @@ using MultiComponent2NativeComponentShadowNode = ConcreteViewShadowNode<
     MultiComponent2NativeComponentEventEmitter,
     MultiComponent2NativeComponentState>;
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
diff --git a/packages/react-native-codegen/src/generators/components/__tests__/__snapshots__/GenerateStateCpp-test.js.snap b/packages/react-native-codegen/src/generators/components/__tests__/__snapshots__/GenerateStateCpp-test.js.snap
index 81112bcefb78cf..0a4a8d39f1606e 100644
--- a/packages/react-native-codegen/src/generators/components/__tests__/__snapshots__/GenerateStateCpp-test.js.snap
+++ b/packages/react-native-codegen/src/generators/components/__tests__/__snapshots__/GenerateStateCpp-test.js.snap
@@ -13,13 +13,11 @@ Map {
  */
 #include <react/renderer/components/ARRAY_PROPS/States.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -37,13 +35,11 @@ Map {
  */
 #include <react/renderer/components/ARRAY_PROPS_WITH_NESTED_OBJECT/States.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -61,13 +57,11 @@ Map {
  */
 #include <react/renderer/components/BOOLEAN_PROP/States.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -85,13 +79,11 @@ Map {
  */
 #include <react/renderer/components/COLOR_PROP/States.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -109,13 +101,11 @@ Map {
  */
 #include <react/renderer/components/COMMANDS/States.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -133,13 +123,11 @@ Map {
  */
 #include <react/renderer/components/COMMANDS_AND_PROPS/States.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -157,13 +145,11 @@ Map {
  */
 #include <react/renderer/components/DIMENSION_PROP/States.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -181,13 +167,11 @@ Map {
  */
 #include <react/renderer/components/DOUBLE_PROPS/States.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -205,13 +189,11 @@ Map {
  */
 #include <react/renderer/components/EVENT_NESTED_OBJECT_PROPS/States.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -229,13 +211,11 @@ Map {
  */
 #include <react/renderer/components/EVENT_PROPS/States.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -253,13 +233,11 @@ Map {
  */
 #include <react/renderer/components/EVENTS_WITH_PAPER_NAME/States.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -277,13 +255,11 @@ Map {
  */
 #include <react/renderer/components/EXCLUDE_ANDROID/States.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -301,13 +277,11 @@ Map {
  */
 #include <react/renderer/components/EXCLUDE_ANDROID_IOS/States.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -325,13 +299,11 @@ Map {
  */
 #include <react/renderer/components/EXCLUDE_IOS_TWO_COMPONENTS_DIFFERENT_FILES/States.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -349,13 +321,11 @@ Map {
  */
 #include <react/renderer/components/FLOAT_PROPS/States.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -373,13 +343,11 @@ Map {
  */
 #include <react/renderer/components/IMAGE_PROP/States.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -397,13 +365,11 @@ Map {
  */
 #include <react/renderer/components/INSETS_PROP/States.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -421,13 +387,11 @@ Map {
  */
 #include <react/renderer/components/INT32_ENUM_PROP/States.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -445,13 +409,11 @@ Map {
  */
 #include <react/renderer/components/INTEGER_PROPS/States.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -469,13 +431,11 @@ Map {
  */
 #include <react/renderer/components/INTERFACE_ONLY/States.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -493,13 +453,11 @@ Map {
  */
 #include <react/renderer/components/MIXED_PROP/States.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -517,13 +475,11 @@ Map {
  */
 #include <react/renderer/components/MULTI_NATIVE_PROP/States.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -541,13 +497,11 @@ Map {
  */
 #include <react/renderer/components/NO_PROPS_NO_EVENTS/States.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -565,13 +519,11 @@ Map {
  */
 #include <react/renderer/components/OBJECT_PROPS/States.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -589,13 +541,11 @@ Map {
  */
 #include <react/renderer/components/POINT_PROP/States.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -613,13 +563,11 @@ Map {
  */
 #include <react/renderer/components/STRING_ENUM_PROP/States.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -637,13 +585,11 @@ Map {
  */
 #include <react/renderer/components/STRING_PROP/States.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -661,13 +607,11 @@ Map {
  */
 #include <react/renderer/components/TWO_COMPONENTS_DIFFERENT_FILES/States.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
@@ -685,13 +629,11 @@ Map {
  */
 #include <react/renderer/components/TWO_COMPONENTS_SAME_FILE/States.h>
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 
 
-} // namespace react
-} // namespace facebook
+} // namespace facebook::react
 ",
 }
 `;
diff --git a/packages/react-native-codegen/src/generators/components/__tests__/__snapshots__/GenerateStateH-test.js.snap b/packages/react-native-codegen/src/generators/components/__tests__/__snapshots__/GenerateStateH-test.js.snap
index c295dcfc57a1fb..58b9b1d9ca3d43 100644
--- a/packages/react-native-codegen/src/generators/components/__tests__/__snapshots__/GenerateStateH-test.js.snap
+++ b/packages/react-native-codegen/src/generators/components/__tests__/__snapshots__/GenerateStateH-test.js.snap
@@ -18,8 +18,7 @@ Map {
 #include <react/renderer/mapbuffer/MapBufferBuilder.h>
 #endif
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 class ArrayPropsNativeComponentState {
 public:
@@ -36,8 +35,7 @@ public:
 #endif
 };
 
-} // namespace react
-} // namespace facebook",
+} // namespace facebook::react",
 }
 `;
 
@@ -59,8 +57,7 @@ Map {
 #include <react/renderer/mapbuffer/MapBufferBuilder.h>
 #endif
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 class ArrayPropsNativeComponentState {
 public:
@@ -77,8 +74,7 @@ public:
 #endif
 };
 
-} // namespace react
-} // namespace facebook",
+} // namespace facebook::react",
 }
 `;
 
@@ -100,8 +96,7 @@ Map {
 #include <react/renderer/mapbuffer/MapBufferBuilder.h>
 #endif
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 class BooleanPropNativeComponentState {
 public:
@@ -118,8 +113,7 @@ public:
 #endif
 };
 
-} // namespace react
-} // namespace facebook",
+} // namespace facebook::react",
 }
 `;
 
@@ -141,8 +135,7 @@ Map {
 #include <react/renderer/mapbuffer/MapBufferBuilder.h>
 #endif
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 class ColorPropNativeComponentState {
 public:
@@ -159,8 +152,7 @@ public:
 #endif
 };
 
-} // namespace react
-} // namespace facebook",
+} // namespace facebook::react",
 }
 `;
 
@@ -182,8 +174,7 @@ Map {
 #include <react/renderer/mapbuffer/MapBufferBuilder.h>
 #endif
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 class CommandNativeComponentState {
 public:
@@ -200,8 +191,7 @@ public:
 #endif
 };
 
-} // namespace react
-} // namespace facebook",
+} // namespace facebook::react",
 }
 `;
 
@@ -223,8 +213,7 @@ Map {
 #include <react/renderer/mapbuffer/MapBufferBuilder.h>
 #endif
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 class CommandNativeComponentState {
 public:
@@ -241,8 +230,7 @@ public:
 #endif
 };
 
-} // namespace react
-} // namespace facebook",
+} // namespace facebook::react",
 }
 `;
 
@@ -264,8 +252,7 @@ Map {
 #include <react/renderer/mapbuffer/MapBufferBuilder.h>
 #endif
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 class DimensionPropNativeComponentState {
 public:
@@ -282,8 +269,7 @@ public:
 #endif
 };
 
-} // namespace react
-} // namespace facebook",
+} // namespace facebook::react",
 }
 `;
 
@@ -305,8 +291,7 @@ Map {
 #include <react/renderer/mapbuffer/MapBufferBuilder.h>
 #endif
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 class DoublePropNativeComponentState {
 public:
@@ -323,8 +308,7 @@ public:
 #endif
 };
 
-} // namespace react
-} // namespace facebook",
+} // namespace facebook::react",
 }
 `;
 
@@ -346,8 +330,7 @@ Map {
 #include <react/renderer/mapbuffer/MapBufferBuilder.h>
 #endif
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 class EventsNestedObjectNativeComponentState {
 public:
@@ -364,8 +347,7 @@ public:
 #endif
 };
 
-} // namespace react
-} // namespace facebook",
+} // namespace facebook::react",
 }
 `;
 
@@ -387,8 +369,7 @@ Map {
 #include <react/renderer/mapbuffer/MapBufferBuilder.h>
 #endif
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 class EventsNativeComponentState {
 public:
@@ -405,8 +386,7 @@ public:
 #endif
 };
 
-} // namespace react
-} // namespace facebook",
+} // namespace facebook::react",
 }
 `;
 
@@ -428,13 +408,11 @@ Map {
 #include <react/renderer/mapbuffer/MapBufferBuilder.h>
 #endif
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 
 
-} // namespace react
-} // namespace facebook",
+} // namespace facebook::react",
 }
 `;
 
@@ -456,8 +434,7 @@ Map {
 #include <react/renderer/mapbuffer/MapBufferBuilder.h>
 #endif
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 class ExcludedAndroidComponentState {
 public:
@@ -474,8 +451,7 @@ public:
 #endif
 };
 
-} // namespace react
-} // namespace facebook",
+} // namespace facebook::react",
 }
 `;
 
@@ -497,8 +473,7 @@ Map {
 #include <react/renderer/mapbuffer/MapBufferBuilder.h>
 #endif
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 class ExcludedAndroidIosComponentState {
 public:
@@ -515,8 +490,7 @@ public:
 #endif
 };
 
-} // namespace react
-} // namespace facebook",
+} // namespace facebook::react",
 }
 `;
 
@@ -538,8 +512,7 @@ Map {
 #include <react/renderer/mapbuffer/MapBufferBuilder.h>
 #endif
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 class ExcludedIosComponentState {
 public:
@@ -571,8 +544,7 @@ public:
 #endif
 };
 
-} // namespace react
-} // namespace facebook",
+} // namespace facebook::react",
 }
 `;
 
@@ -594,8 +566,7 @@ Map {
 #include <react/renderer/mapbuffer/MapBufferBuilder.h>
 #endif
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 class FloatPropNativeComponentState {
 public:
@@ -612,8 +583,7 @@ public:
 #endif
 };
 
-} // namespace react
-} // namespace facebook",
+} // namespace facebook::react",
 }
 `;
 
@@ -635,8 +605,7 @@ Map {
 #include <react/renderer/mapbuffer/MapBufferBuilder.h>
 #endif
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 class ImagePropNativeComponentState {
 public:
@@ -653,8 +622,7 @@ public:
 #endif
 };
 
-} // namespace react
-} // namespace facebook",
+} // namespace facebook::react",
 }
 `;
 
@@ -676,8 +644,7 @@ Map {
 #include <react/renderer/mapbuffer/MapBufferBuilder.h>
 #endif
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 class InsetsPropNativeComponentState {
 public:
@@ -694,8 +661,7 @@ public:
 #endif
 };
 
-} // namespace react
-} // namespace facebook",
+} // namespace facebook::react",
 }
 `;
 
@@ -717,8 +683,7 @@ Map {
 #include <react/renderer/mapbuffer/MapBufferBuilder.h>
 #endif
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 class Int32EnumPropsNativeComponentState {
 public:
@@ -735,8 +700,7 @@ public:
 #endif
 };
 
-} // namespace react
-} // namespace facebook",
+} // namespace facebook::react",
 }
 `;
 
@@ -758,8 +722,7 @@ Map {
 #include <react/renderer/mapbuffer/MapBufferBuilder.h>
 #endif
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 class IntegerPropNativeComponentState {
 public:
@@ -776,8 +739,7 @@ public:
 #endif
 };
 
-} // namespace react
-} // namespace facebook",
+} // namespace facebook::react",
 }
 `;
 
@@ -799,13 +761,11 @@ Map {
 #include <react/renderer/mapbuffer/MapBufferBuilder.h>
 #endif
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 
 
-} // namespace react
-} // namespace facebook",
+} // namespace facebook::react",
 }
 `;
 
@@ -827,8 +787,7 @@ Map {
 #include <react/renderer/mapbuffer/MapBufferBuilder.h>
 #endif
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 class MixedPropNativeComponentState {
 public:
@@ -845,8 +804,7 @@ public:
 #endif
 };
 
-} // namespace react
-} // namespace facebook",
+} // namespace facebook::react",
 }
 `;
 
@@ -868,8 +826,7 @@ Map {
 #include <react/renderer/mapbuffer/MapBufferBuilder.h>
 #endif
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 class ImageColorPropNativeComponentState {
 public:
@@ -886,8 +843,7 @@ public:
 #endif
 };
 
-} // namespace react
-} // namespace facebook",
+} // namespace facebook::react",
 }
 `;
 
@@ -909,8 +865,7 @@ Map {
 #include <react/renderer/mapbuffer/MapBufferBuilder.h>
 #endif
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 class NoPropsNoEventsComponentState {
 public:
@@ -927,8 +882,7 @@ public:
 #endif
 };
 
-} // namespace react
-} // namespace facebook",
+} // namespace facebook::react",
 }
 `;
 
@@ -950,8 +904,7 @@ Map {
 #include <react/renderer/mapbuffer/MapBufferBuilder.h>
 #endif
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 class ObjectPropsState {
 public:
@@ -968,8 +921,7 @@ public:
 #endif
 };
 
-} // namespace react
-} // namespace facebook",
+} // namespace facebook::react",
 }
 `;
 
@@ -991,8 +943,7 @@ Map {
 #include <react/renderer/mapbuffer/MapBufferBuilder.h>
 #endif
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 class PointPropNativeComponentState {
 public:
@@ -1009,8 +960,7 @@ public:
 #endif
 };
 
-} // namespace react
-} // namespace facebook",
+} // namespace facebook::react",
 }
 `;
 
@@ -1032,8 +982,7 @@ Map {
 #include <react/renderer/mapbuffer/MapBufferBuilder.h>
 #endif
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 class StringEnumPropsNativeComponentState {
 public:
@@ -1050,8 +999,7 @@ public:
 #endif
 };
 
-} // namespace react
-} // namespace facebook",
+} // namespace facebook::react",
 }
 `;
 
@@ -1073,8 +1021,7 @@ Map {
 #include <react/renderer/mapbuffer/MapBufferBuilder.h>
 #endif
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 class StringPropComponentState {
 public:
@@ -1091,8 +1038,7 @@ public:
 #endif
 };
 
-} // namespace react
-} // namespace facebook",
+} // namespace facebook::react",
 }
 `;
 
@@ -1114,8 +1060,7 @@ Map {
 #include <react/renderer/mapbuffer/MapBufferBuilder.h>
 #endif
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 class MultiFile1NativeComponentState {
 public:
@@ -1147,8 +1092,7 @@ public:
 #endif
 };
 
-} // namespace react
-} // namespace facebook",
+} // namespace facebook::react",
 }
 `;
 
@@ -1170,8 +1114,7 @@ Map {
 #include <react/renderer/mapbuffer/MapBufferBuilder.h>
 #endif
 
-namespace facebook {
-namespace react {
+namespace facebook::react {
 
 class MultiComponent1NativeComponentState {
 public:
@@ -1203,7 +1146,6 @@ public:
 #endif
 };
 
-} // namespace react
-} // namespace facebook",
+} // namespace facebook::react",
 }
 `;